Database Develop

Note 8 Unlocked Missing HD VOICE and VIDEO CALLING

I am uncertain which information is true or false, but thought I would ask here. I realized I may be missing a few features when I bought the unlocked Note 8. However, I was under the impression that I could somehow enable things like HD voice and Video Calling.
If I am able to do this, can someone provide a link to a guide I can follow for the Note 8? I realize there are third party apps. But, I was hoping to achieve the above naively.
I'm Currently with AT&T, but prefer the ability to Hot-Spot by using an unlocked version of the Note. Hopefully someone who has enabled this can chime in.

I currently have an ATT Note 8 and I have a similar question. I want to flash the unlocked firmware so I can use it on T-Mobile. I've looked online and couldn't find an answer hope someone here can help us.

So my understanding is that AT&T only allows things like HD Voice, Video Calling, VoLTE, Wi-Fi Calling, etc. On their branded device's. It's why I actually didn't get the unlocked device even though I previously had a Note 7.

fireguy0306 said:
So my understanding is that AT&T only allows things like HD Voice, Video Calling, VoLTE, Wi-Fi Calling, etc. On their branded device's. It's why I actually didn't get the unlocked device even though I previously had a Note 7.
Click to expand...
Click to collapse
This was my understanding as well, but, I thought someone came up with a clever way of enabling these features. Hot spot and the ability to jump carriers were more important features than the others... which is why I went with unlocked. Am stuck in an unlimited data plan with AT&T for one more year. Unfortunately, they don't allow any kind of hotspot with unlimited plan.

Since the phone just became available and only to few people (BTW I'm still waiting), you guys have to wait , because since all those are hacks, phones have to get to right hands and then may take some time to figure things out, unless any of you have enough knowledge, then head to S8/S8+ forum and try using those solutions on your Note 8, may even work.

When I booted my Note 8 with T-mobile sim card, it applied some carrier customization and enabled VoLTE and WiFI calling but video calling is missing which I don't use much anyways.

You can usually do this via the service modes:
Dial *#0011# may work
Press the Menu key and then Back
Press Menu again then Key input and enter the value 1.
Wait a little
Press Menu and then Back
Press DEBUG SCREEN
Press WB-AMR SETTINGS
Press WB-AMR ENABLE
This use to work on previous models.
(In the UK being shafted by a long wait for my Note 8)

I thought many of the methods wouldn't work since AT&T uses whitelists on their system and it's not just the features are missing from the OS.

I tried the *#0011# and was able to get all the way to debug. That screen or option is not showing up on my unlocked note 8.
Ryya said:
You can usually do this via the service modes:
Dial *#0011# may work
Press the Menu key and then Back
Press Menu again then Key input and enter the value 1.
Wait a little
Press Menu and then Back
Press DEBUG SCREEN
Press WB-AMR SETTINGS
Press WB-AMR ENABLE
This use to work on previous models.
(In the UK being shafted by a long wait for my Note 8)
Click to expand...
Click to collapse

I know the S8 crowd has been flashing the carries specific CSC/CP files through a modified ODIN on top of the UNLOCKED firmware. I'm sure this will work on the note 8 as well. The modem should enable all the carrier specific bands and the CSC should enable the wifi calling and VOLTE. on a side note, check in the settings menu for the wifi calling. when I flashed the T mobile CP over the U firmware, I did not have a WIFI calling quick toggle but I did have wifi calling the in the regular settings menu. I had to toggle it on and off that way.

No where to be found for VZW on unlocked

Wi-Fi Calling is in the phone settings on the unlocked version...I have not seen HD or video though...WiFi calling works awesomely

BlueFox721 said:
Wi-Fi Calling is in the phone settings on the unlocked version...I have not seen HD or video though...WiFi calling works awesomely
Click to expand...
Click to collapse
You on AT&T or T-Mobile?

JameyS said:
This was my understanding as well, but, I thought someone came up with a clever way of enabling these features. Hot spot and the ability to jump carriers were more important features than the others... which is why I went with unlocked. Am stuck in an unlimited data plan with AT&T for one more year. Unfortunately, they don't allow any kind of hotspot with unlimited plan.
Click to expand...
Click to collapse
Are you on an old grandfathered in AT&T unlimited plan? I have a new Unlimited plan and they offer lots of goodies including a 10GB/month hotspot for each phone.
Check them out: https://www.att.com/plans/unlimited-data-plans.html
You should not be stuck in any plan now for a year or any time frame. Change when you want to change.
Here's a link to information for Flashing the Unlocked Firmware and Carrier Switching on the Snapdragon S8+ (no rooting necessary). https://forum.xda-developers.com/galaxy-s8+/how-to/carrier-switch-snapdragon-t3615680
Probably going to be similar with our Note 8s.

Im on Verizon and I cant see wifi calling or HD voice aka VOLTE. Maybe we just need to wait.

This may help for people looking for video calling
https://forum.xda-developers.com/galaxy-note-8/how-to/guide-to-enabling-video-calling-t3670523

skinnytoo2 said:
No where to be found for VZW on unlocked
Click to expand...
Click to collapse
I had to download the app "shortcut master". Navigate to to IMS Settings, click RCS Configuration and enabled everything. I also can see the WB settings under "DM Configuration" under the IMS settings but they are relabeled as xxx_WB and instead of enabled/disabled, it is a 0 or 1. I believe the 1 is enabled. Probably need to restart as well but I am uncertain.
The outstanding question I have is do I need to change HD_VOICE under the DM configuration from a 0 to 1 as I see that there as well.

lebodano said:
I had to download the app "shortcut master". Navigate to to IMS Settings, click RCS Configuration and enabled everything. I also can see the WB settings under "DM Configuration" under the IMS settings but they are relabeled as xxx_WB and instead of enabled/disabled, it is a 0 or 1. I believe the 1 is enabled. Probably need to restart as well but I am uncertain.
The outstanding question I have is do I need to change HD_VOICE under the DM configuration from a 0 to 1 as I see that there as well.
Click to expand...
Click to collapse
I downloaded the shorcut master. However when i try to change anything, it says SU: not found. I also saw in there about the HD voice enabled. But am not able to launch any type of editor. I have the note 8 unlocked version, using straight talk sim card on verizon towers. I would love to be able to talk on the phone and surf the internet at the same time.
anyone able to get this working on the unlocked version?

I have video calling & HD Voice working on unlocked model with VZW SIM on gUDP, I almost had WiFi Calling working; but broke video calling. I'm hoping to get both working; WiFi Calling works with T-Mobile SIM out of the box. I haven't messed with my AT&T SIM to see if any of the features work; but maybe this week I will.

WinDroidGuy said:
I have video calling & HD Voice working on unlocked model with VZW SIM on gUDP, I almost had WiFi Calling working; but broke video calling. I'm hoping to get both working; WiFi Calling works with T-Mobile SIM out of the box. I haven't messed with my AT&T SIM to see if any of the features work; but maybe this week I will.
Click to expand...
Click to collapse
How did you get video calling working. I still have yet to successfully place the call.

Tips for Getting Functional Wifi Calling on AT&T.

Since there have been a few posts about people wanting to get their non-AT&T S9 working on AT&T with all the advanced features, I figured I'd post some tips since I have 2 S9s that have been successfully converted.
1. You must come from a U1 firmware to the AT&T U Firmware.
2. Make sure your Sim Card is fairly new. I have had sim cards work in an older phone but not a newer one.
3. Have AT&T hard set the IMEI of a AT&T branded phone(that supports wifi calling). Do this by putting your sim card into the AT&T branded phone and call AT&T customer service and say your Wifi calling and HD Voice are not working.
4. Make sure Wifi Calling was active on the AT&T branded phone before moving the sim card to the S9.

Also make sure you have ATT csc installed. There are a few required apks that are in the odm folder. I was able to get it working on a SM-G965F

I wonder what else could be tried?
I have done all of the above coming off a brand new unlocked U1, flashed the U FirmWare with ATT User data file. I can actually setup WiFi calling on the new handset (it doesn't really work ,however) and about 10 minutes later I get a provisioning failed message.

BigQuark said:
I wonder what else could be tried?
I have done all of the above coming off a brand new unlocked U1, flashed the U FirmWare with ATT User data file. I can actually setup WiFi calling on the new handset (it doesn't really work ,however) and about 10 minutes later I get a provisioning failed message.
Click to expand...
Click to collapse
The other phone you have with wifi calling provisions just fine on the same wifi network?

ajairola said:
The other phone you have with wifi calling provisions just fine on the same wifi network?
Click to expand...
Click to collapse
Funny you should ask this. Up until last night I could swap the SIM into the old phone and WIFi calling would provision and work. I tried this morning and the old phone is now giving me the same "ooops... we cannot provision..." message. I was thinking bad SIM card again? It's 10 days old though.
EDIT: Chatted ATT and verified they have the old IMEI set from the old phone that had working wifi calling.

BigQuark said:
Funny you should ask this. Up until last night I could swap the SIM into the old phone and WIFi calling would provision and work. I tried this morning and the old phone is now giving me the same "ooops... we cannot provision..." message. I was thinking bad SIM card again? It's 10 days old though.
EDIT: Chatted ATT and verified they have the old IMEI set from the old phone that had working wifi calling.
Click to expand...
Click to collapse
I've had provisioning fail on certain wifi networks, do you have somewhere with stable wifi where you could try again?

ajairola said:
I've had provisioning fail on certain wifi networks, do you have somewhere with stable wifi where you could try again?
Click to expand...
Click to collapse
I will be at work tomorrow which is located near the ATT store also and at work I have access to a fiber fed service with WiFi for "Non Work" use that is great and I will try that. I have Gigabit CATV internet at home wired thru a Ubiquiti Router and POE Switch and using a MU-MIMO (UAP HD Nano) access point which gives me a 433mbps wifi link to my S9. At home, I also have a 1st GEN At&t Micro-cell which I have left unplugged in case that could be an issue.
If WIfi calling doesn't activate on the work wi-fi then I will grab another SIM card at the at&t store and try again.

BigQuark said:
I will be at work tomorrow which is located near the ATT store also and at work I have access to a fiber fed service with WiFi for "Non Work" use that is great and I will try that. I have Gigabit CATV internet at home wired thru a Ubiquiti Router and POE Switch and using a MU-MIMO (UAP HD Nano) access point which gives me a 433mbps wifi link to my S9. At home, I also have a 1st GEN At&t Micro-cell which I have left unplugged in case that could be an issue.
If WIfi calling doesn't activate on the work wi-fi then I will grab another SIM card at the at&t store and try again.
Click to expand...
Click to collapse
Sounds like a plan. I wish I knew why wifi calling is such a pain, I could never get it to provision on my old AT&T uverse internet. I ended up provisioning my Dad's Galaxy S9 wifi calling via the hotspot my S9. If anyone you know would be able to hotspot their At&t phone that might let you provision wifi calling.

1. ATT must have a Samsung Branded ATT Phone's IMEI in the system, so that the features are allowed on your phone.
2. If you have U1, you need to use the U CSC, the U1 CSC breaks wifi calling and all other features that AT&T gives you.
3. If you are able to get root, and can see the system apps,
Under App Folder you need to have
UnifiedWFC
Vsimservice
Under Priv-App You Need to have
NSDSWebApp
WfcServiceV2
3. When you are trying to enable Wifi Calling Service, what happens when you click the wifi calling quick toggle.

Psyscope said:
1. ATT must have a Samsung Branded ATT Phone's IMEI in the system, so that the features are allowed on your phone.
2. If you have U1, you need to use the U CSC, the U1 CSC breaks wifi calling and all other features that AT&T gives you.
3. If you are able to get root, and can see the system apps,
Under App Folder you need to have
UnifiedWFC
Vsimservice
Under Priv-App You Need to have
NSDSWebApp
WfcServiceV2
3. When you are trying to enable Wifi Calling Service, what happens when you click the wifi calling quick toggle.
Click to expand...
Click to collapse
Could not provision on my work wifi or my AT&T iPad hot spot wifi.
I went to the AT&T store and got another new SIM card. I then chatted 5 or 6 AT&T Cust Svc. agents and got one that re-provisioned the IMS features and set my IMEI from the S7. They now work on my ATT branded S7, but not on the unlocked S9.
Within 3 second of toggling the WIFI calling feature I get the "ooooops we cant turn on wifi calling, please have an authorized person call.........."
I flashed the HOME CSC when coming from U1 to U. Can I just flash the U CSC as is, or would it be better to flash back to u1 and then back to U with the proper CSC.?
It would appear I had several obstacles to getting this enabled.

BigQuark said:
Could not provision on my work wifi or my AT&T iPad hot spot wifi.
I went to the AT&T store and got another new SIM card. I then chatted 5 or 6 AT&T Cust Svc. agents and got one that re-provisioned the IMS features and set my IMEI from the S7. They now work on my ATT branded S7, but not on the unlocked S9.
Within 3 second of toggling the WIFI calling feature I get the "ooooops we cant turn on wifi calling, please have an authorized person call.........."
I flashed the HOME CSC when coming from U1 to U. Can I just flash the U CSC as is, or would it be better to flash back to u1 and then back to U with the proper CSC.?
It would appear I had several obstacles to getting this enabled.
Click to expand...
Click to collapse
LOL Failed again!!!
Flashed U firmware and ATT User Data file. Nothing works. Same message.
What is "...Also make sure you have ATT csc installed......?" I have not been able to find any FW that is AT&T for the U. Every other carrier, yes. but no AT&T.
SO I have flashed back and forth a few times this evening. I did not locate a specific "ATT" CSC file. I did find the ATT USerData file that places the WiFi calling option in the menu like always. So it looks like you can use IMS features on ATT as long as you have the ATT U Version or a Carrier U version variant.
However, If you have the U1 version then it is not possible to use these IMS features on ATT.

I think you can just flash straight to U make sure your sim card is in the phone. If it doesn't work, try factory reset and then flash U CSC
I forget are you able to root to see what system files you have?
You could probably update the phone to the newest U1 buold, but switch out the csc with the U.
---------- Post added at 08:15 PM ---------- Previous post was at 08:13 PM ----------
BigQuark said:
LOL Failed again!!!
Flashed U firmware and ATT User Data file. Nothing works. Same message.
What is "...Also make sure you have ATT csc installed......?" I have not been able to find any FW that is AT&T for the U. Every other carrier, yes. but no AT&T.
SO I have flashed back and forth a few times this evening. I did not locate a specific "ATT" CSC file. I did find the ATT USerData file that places the WiFi calling option in the menu like always. So it looks like you can use IMS features on ATT as long as you have the ATT U Version or a Carrier U version variant.
However, If you have the U1 version then it is not possible to use these IMS features on ATT.
Click to expand...
Click to collapse
All U CSC's include att CSC.

Not rooted yet. Looking forward to it. I'm on U FW now. I couldn't get the IMS features working but I strongly suspect its AT&T. If AT&T
Disabled and enables my IMS on their end then my S7 wifi
Calling works. So into my S9 the SIM goes, it allows me
To check my 911 address and begins to provision but usually
Fails within 10 minutes.
Then, from there on I get the standard "Oops we cant provision" error message on subsequent attempts. Which requires lengthy calls to ATT to disable & enable IMS again. This makes me believe that my S9 IMEI is getting checked and flagged, then IMS is disabled.
Out of the blue I got a forced ATT OTA update today that updated my FW to ARBI, now I see another pending software update waiting. For the new boot loader I assume.
I did try my MINT Mobile SIM and even on the ATT FW I got the IMS features to work, and toggle in the "secret" device info.
I thought I'd give it a go w/o rooting.

My auto-update OFF was overridden and I got pushed the G960USQS2ARF4 to my handset last night.......

US OR US1? Well you can flash the arf4 U CSC right?
So they have you with an ATT S7 ? PM me or telegram me at @Psyscope I'll give you an imei for s8 that will make sure you should have wifi calling provisioned for your account.

These three apps are needed do you have them when you go to Apps?

BigQuark said:
My auto-update OFF was overridden and I got pushed the G960USQS2ARF4 to my handset last night.......
Click to expand...
Click to collapse
Sounds like you are running the latest AT&T firmware. If you put your sim into the S7 and call AT&T Customer service and report that Wifi calling isn't working(make sure they hard set the IMEI of the S7 to your account), then re-activate wifi calling on your S7 and then move your sim card into the S9, and try to activate wifi calling.

Psyscope said:
1. ATT must have a Samsung Branded ATT Phone's IMEI in the system, so that the features are allowed on your phone.
2. If you have U1, you need to use the U CSC, the U1 CSC breaks wifi calling and all other features that AT&T gives you.
3. If you are able to get root, and can see the system apps,
Under App Folder you need to have
UnifiedWFC
Vsimservice
Under Priv-App You Need to have
NSDSWebApp
WfcServiceV2
3. When you are trying to enable Wifi Calling Service, what happens when you click the wifi calling quick toggle.
Click to expand...
Click to collapse
Could one of you kind folks upload the above mentioned files from an S9 device for me .......... I am experimenting with an S9 port on my S7 Edge and can get WiFi Calling to provision but it still doesn't seem to work on the Phone app itself.
I get all of the activation responses and can even modify my Emergency Location dialog etc. , but no work with WiFi only or poor cellular area.
My CSC Flash and device doesn't have WFCServiceV2 ( just WFCService) and I don't have UnifiedWFC in the app folder
I can get WiFi Calling on Nougat and finally today on Oreo --- but I'd really like to run the Sac23 Port --- it seems the smoothest
Thank you !!!!!
---------- Post added at 07:39 PM ---------- Previous post was at 07:30 PM ----------
ajairola said:
Sounds like you are running the latest AT&T firmware. If you put your sim into the S7 and call AT&T Customer service and report that Wifi calling isn't working(make sure they hard set the IMEI of the S7 to your account), then re-activate wifi calling on your S7 and then move your sim card into the S9, and try to activate wifi calling.
Click to expand...
Click to collapse
Question --- This is kinda what I've done in the past to get calling features on ATT but I do it by going to my AT&T Business portal (I'm a business customer) and changing the IMEI there. That has worked for me in the past by using an IMEI from a branded store model phone - lol
But I have had some issues ---- when the IMEI that I put in the billing portal doesn't match my actual phone that I'm using then When I go to Phone > Settings > More Settings > Call Forwarding I often get errors or can't set the provisional forwarding numbers (I used Youmail for Voicemail in the past and currently I have been (when Busy, Unreachable , or Unanswered) forwarding to my Google Voice phone number that now has a Google Voice over WiFi Beta program. The other issue is that setting the IMEI to another number messes up Call Forwarding with things like Samsung Gear (AT&T numberSync) ???
What exactly did you get the AT&T Customer Support to do when you called ? maybe its different than what I'm doing in my Business Portal

A different imei has no effect on forwarding, that's related to your sim card. The IMEi if it is an AT&T branded one you call them and tell then to update it to one that's linked to an att branded Samsung phone that is wifi calling capable.
In regards to the s7 edge you would need to extract the csc files from an odin. Then find a custom rom and move the files around. Are you using the an unlocked S7 edge u or F? Because ttkg has a CSC selector.
---------- Post added at 12:50 AM ---------- Previous post was at 12:46 AM ----------
jcrompton said:
Could one of you kind folks upload the above mentioned files from an S9 device for me .......... I am experimenting with an S9 port on my S7 Edge and can get WiFi Calling to provision but it still doesn't seem to work on the Phone app itself.
I get all of the activation responses and can even modify my Emergency Location dialog etc. , but no work with WiFi only or poor cellular area.
My CSC Flash and device doesn't have WFCServiceV2 ( just WFCService) and I don't have UnifiedWFC in the app folder
I can get WiFi Calling on Nougat and finally today on Oreo --- but I'd really like to run the Sac23 Port --- it seems the smoothest
Thank you !!!!!
---------- Post added at 07:39 PM ---------- Previous post was at 07:30 PM ----------
Question --- This is kinda what I've done in the past to get calling features on ATT but I do it by going to my AT&T Business portal (I'm a business customer) and changing the IMEI there. That has worked for me in the past by using an IMEI from a branded store model phone - lol
But I have had some issues ---- when the IMEI that I put in the billing portal doesn't match my actual phone that I'm using then When I go to Phone > Settings > More Settings > Call Forwarding I often get errors or can't set the provisional forwarding numbers (I used Youmail for Voicemail in the past and currently I have been (when Busy, Unreachable , or Unanswered) forwarding to my Google Voice phone number that now has a Google Voice over WiFi Beta program. The other issue is that setting the IMEI to another number messes up Call Forwarding with things like Samsung Gear (AT&T numberSync) ???
What exactly did you get the AT&T Customer Support to do when you called ? maybe its different than what I'm doing in my Business Portal
Click to expand...
Click to collapse
You know call forwarding rarely works that way. There is the feature
Where you manually setup forwarding.
Dial **21*, followed by the 10-digit number you wish to forward the calls to, then dial #. For example, **21*1235556789# forwards your call to 123.555.6789.

Psyscope said:
A different imei has no effect on forwarding, that's related to your sim card. The IMEi if it is an AT&T branded one you call them and tell then to update it to one that's linked to an att branded Samsung phone that is wifi calling capable.
In regards to the s7 edge you would need to extract the csc files from an odin. Then find a custom rom and move the files around. Are you using the an unlocked S7 edge u or F? Because ttkg has a CSC selector.
---------- Post added at 12:50 AM ---------- Previous post was at 12:46 AM ----------
You know call forwarding rarely works that way. There is the feature
Where you manually setup forwarding.
Dial **21*, followed by the 10-digit number you wish to forward the calls to, then dial #. For example, **21*1235556789# forwards your call to 123.555.6789.
Click to expand...
Click to collapse
Any chance you could help me with those two files I'm missing --- assuming you are rooted ?
"My CSC Flash zip and device doesn't have WFCServiceV2 ( just WFCService) and I don't have UnifiedWFC in the app folder"
Thanks

Flashed AT&T Firmware to my unlocked Note9, no VoLTE?

So I tried digging around and haven't found any similar situations. I flashed the ATT firmware to my Unlocked Note 9. I get WiFi calling and Visual Voice Mail. However, under Settings -> Connections -> Mobile Networks there is no options for "Enhanced LTE services" or something like that. I also do not get e VoLTE symbol in the status bar like I've seen on others devices. Am I missing something? Should I try swapping the SIM card? Any insight would be great. Cheers!

Naterade said:
So I tried digging around and haven't found any similar situations. I flashed the ATT firmware to my Unlocked Note 9. I get WiFi calling and Visual Voice Mail. However, under Settings -> Connections -> Mobile Networks there is no options for "Enhanced LTE services" or something like that. I also do not get e VoLTE symbol in the status bar like I've seen on others devices. Am I missing something? Should I try swapping the SIM card? Any insight would be great. Cheers!
Click to expand...
Click to collapse
It's been discussed a lot here. The basic ideal is that AT&T, moreso than any other carrier, likes to restrict features from devices they didn't sell. It's done by the IMEI on the line. Firmware is one part of the equation, as you've discovered, but certain things just will not work without more steps.
Essentially, here's the process: Find a real AT&T device capable of VoLTE. Swap the IMEI of that device onto your line temporarily by placing your SIM card in it. You might also have to call AT&T and have them swap the IMEI on your line while the SIM is in. Have AT&T unblock the VoLTE feature. Put the SIM back in the device you actually want to use.

if I buy an unlocked note 9 from best buy i should not see this problem with my T-Mobile sim card right?

alher591 said:
if I buy an unlocked note 9 from best buy i should not see this problem with my T-Mobile sim card right?
Click to expand...
Click to collapse
T-Mobile doesn't care at all where you bought your device. And most features work on unlocked, too. Missing from U1 on TMB:
- Video calling
- Native digits
If you flash to U, you get literally everything the network can do.

I have a AT&T Note 9 and I don't have the VoLTE listed in that area
It must be on by default (hardcoded) or is listed in another area

Restore Call Recording to your Note 9 SM-N960U and SM-N960U1

Purpose: The Google Play Store policy change in March has destroyed this critical functionality for many. Prior to that, using Pie produced very poor quality recordings compared to Oreo. This is how I restored call recording functionality. I will add any noteworthy contributions to this first post to make this easier than it has been for me. Many people have pulled their hair out with me to come up with this. This is simply a consolidation or our trials and errors.
This only works on Note 9 models SM-N960U and SM-N960U1 phones with boot loader version 1. To determine if you can use this procedure:
1. Go into Settings/About Phone to find the model number. It must show SM-N960U or SM-N960U1
2. Then click on "Software Information". On the "Build number", the 5th character from the right must be a 1. If it is not, this procedure will not work for you. If you don't own the phone yet, make ensure it is a 1 before you buy it.
For the SM-N960U model, this procedure will replace your carrier-specific firmware with US Unlocked firmware. It is not possible to prevent the carrier-specific firmware from updating to Pie and forcing other unwanted changes on your phone because it does not have the Blue "Software Update" program (com.wssyncmldm). When you finish, the model number will be changed to SM-N960U1. This process is reversible by flashing the phone with carrier firmware and using the standard ODIN version for that firmware.
The ramifications of moving from the carrier firmware to US Unlocked firmware are:
1. You will be able to flash to and remain on Oreo vs. being forced to Pie.
2. No carrier specific apps are flashed. (USERDATA which some refer to as bloatware)
3. Depending on whether the carrier's service is standards-based or not determines whether or not US UNLOCKED firmware will be able to make their services available.
- Verizon: No VoWiFi (Wi-Fi Calling). Everything else, including HD Voice and Carrier Aggregation work fine. My old phone didn't have it and coverage was never a problem, but if you travel, Wi-Fi calling means you have free calling to and from the US from anywhere you have an Internet connection. That could be prove quite valuable even if later you plan to get a local SIM.
- T-Mobile: Everything works except for roaming US Cellular's network. They have good coverage as of late, and the cheapest and 2nd fastest data.
- Sprint: Some users state that they retained Wi-Fi calling but I haven't heard many confirmations. I would guess if they have that, they also have VoLTE. I haven't heard about carrier aggregation, but if they do in fact have the other two, they probably have it as well. Again, my confirmation has been weak here.
- AT&T: No VoLTE or Voice over Wi-Fi. I haven't heard about carrier aggregation but it clearly doesn't play well with US UNLOCKED.
- after flashing U1 firmware. Wi-Fi calling is useful where you have no cell reception but you do have Wi-Fi and can save you a TON of money in roaming charges or purchasing an International plan. If you cannot get Wi-Fi calling and this is a requirement, you may want to cut out Android, carrier, and phone manufacturer altogether and read If they ever destroy this ability again at the end of this post.
4. You will need to download any carrier specific software you want from your carrier.
DANGER! On the "Build number" you are about to flash, ensure the 5th character from the right is a 1. If you flash one of the newer "U1" Pie updates that has a version 2 boot loader, you will never again be able to flash any version of Oreo, because they are all on version 1. You cannot flash a boot loader back to version 1.
Preparation Considerations:
- WARNING: If you use SmartSwitch to backup your phone, DO NOT press the update button when doing your backup!!! If you do, and it updates your boot loader to a newer version, it is the same as bricking the phone for someone who needs call recording because you can never be able to return to Oreo 8.1. OTOH, SmartSwitch is the only backup program for a non-rooted device that can restore almost everything back the way you had it. Download the setup.exe for the SmartSwitch for Windows, and the APK from APKPure.com. I copied both to a folder on my SD card so that I will always have a matched pair and I can restore without connecting to update software to execute the restore, and you may not want newer versions in the future. Install SmartSwitch on Windows and the phone. Before you do the backup, disconnect and forget Wi-Fi. The reason you want to do this is when you restore the phone and settings, it will also set up Wi-Fi like you had it and it will connect. The problem with that is by default SmartSwitch will start updating everything to the latest before the phone is in a position for you to stop it from happening. With no SIM or Wi-Fi, the phone interface settles first. Then you can put in the SIM and go to the play store and turn off Auto updates and notifications. The SIM doesn't become a problem as rapidly.
- I also recommend using pre-2019 Helium Backup apk and installing it as well as the Windows app version as well on your PC. Helium is more complicated to use, but is very flexible for restoring single apps such as using ADB, which works on any Android phone. Another reason you need it is SmartSwitch will only restore to a Samsung device. A Samsung device might be available or what you want when you need to do a restore. I have only 6 weeks with the Note 9 and have used Helium on my previous phones, so I'm still evaluating if Helium is what is best for the Note 9 and Oreo.
- Consider making a Downloads directory on your SD Card with sub-directories with .apk files that you will want to have available during or after setup, or are in danger of being ruined by an application upgrade so that you can readily restore them if necessary. For instance, mine contains a pre-March 7, 2019 version of SmartSwitch, old version of Helium, Automatic Call Recorder v5.43.11 or earlier, Automatic Call Recorder Pro v5.43.11 or earlier, etc.
Make these slight adjustments to the excellent procedure listed in the first post here: XDA: Confirm These Steps to Downgrade US Unlocked SM-N960U1 from Pie to Oreo
1. Prior to step 7, perform a factory reset from within Settings/General Management -> Factory data reset. If you do not, after flashing the phone, it will force a SIM or Wi-Fi connection to make you log in as a theft protection measure, during which time your phone will begin performing updates before you are in a position to implement measures to stop them. When you perform the factory reset from within Settings/General Management, it had to have been performed by someone who was logged into the phone and thus allows you to skip installing a SIM or enabling Wi-Fi during initial setup script, which in turn enables you to prevent any updates from occurring until you have made your changes.
2. Prior to 13, Do as minimal setup as possible, making sure you turn Wi-Fi off and Skip Wi-Fi. You will not be doing a restore, setting security, or setting up any accounts.
2. After 13.
a. Follow the steps shown here YouTube: HOW TO STOP FORCED OTA UPDATE NOTIFICATION from 0:25-1:49 to change app settings for both Software Update apps found in Settings/Apps and from menu select "Show System Apps". In "Battery", turn off "Allow background activity". In "Notifications", turn off everything. In "Apps that can change system settings" turn it off, but do not go past that point in the video or reboot as the video states to do afterward.
b. Back in Settings/Apps and on menu select Show System Apps. Go into Security Policy updates. In "Battery", turn off "Allow background activity". In "Notifications", turn off everything, and On lock screen set it to Do not show notifications. In "Apps that can change system settings" turn it off. *If this process runs, it aligns the phone's policy with that of the Play Store. It will not automatically update offending software, such as your call recorder, but it will list it. If it lists it, you are toast because the new policy, now implemented on your phone, will cause the now non-compliant previously useful software to hang when you try to use it. I know of no other option than to re-flash your phone and do a restore from a backup or start from scratch.
3. Reboot the phone and go into Settings/Apps/Show system apps, and ensure the Blue Software Update still shows disabled.
4. Prior to 15 install the SD card and install the SmartSwitch apk that was downloaded earlier to your SD Card using the Samsung My Files file manager.
*The following three item numbers must happen rapidly: (Have your play store credentials handy.)
5.. Insert the SIM to gain Internet access, not Wi-Fi if possible.
6. Go to the Play Store and immediately go into into Settings on the left side menu and turn off:
a. Automatic updates.
b. All Notifications
7. Go to your phone in Notifications and cancel all updates. Note: You will want any app updates to happen manually. Some will be affected by the March 2019 Play Store Policy changes that will ruin their functionality. The app developers usually will mention if there are functionality changes due to the new policy in the description area for their apps. When you go into play store and select My Apps, it will show you which ones need updating and you can decide which ones you can update and retain their functionality.
Restore Call Recording. (I use Automatic Call Recorder by Appliqato, but you can make adjustments based on the same logic.)
a. DO NOT download your software from Google Play. Sideload Automatic Call Recorder by Appliqato, sideload version 5.43.11 from an .apk from a Helium or some place like apkpure.com.
b. If you have a Pro license, restore that will need to come from a backup of version 5.43.11 or earlier. You cannot buy a Pro license any other place than the play store at the moment, and the one from Google will be too new.
Reboot and ensure all of your settings are still intact and fix any that are not. On the Blue Software Update icon, it should show a status of disabled next to it.
Going forward:
1. Backup your device with a program that can restore a single application. I've been using Helium, previously named Carbon. It is clumsy, but it makes compact backups into ZIP files, and the backup are stored as .apk files, so you can simply side load to do a restore of the app and data. Make SURE you tell it to include the applications because by default it expects to download the latest version from the play store which is NOT what you want. SmartSwtich is for changing phones or full restores. It is not a substitute for Helium.
2. Backup the PC area where the software to restore your device, firmware, and APKs are to restore your device.
3. Do not use the play store unless you have to. I've been using APKPure, but there may be other good ones also. This enables you to get older versions, which is critical for many critical apps. As I mentioned earlier, you cannot do effective call recording with the current call recording software from the play store. Look for dates prior to 2019. This also pertains to using SIP/VOIP clients because they don't allow them to access your phone book to dial with, and thus cannot keep a useful local log either. Having the APKs enables you to reinstall at any time. What you need may no longer be available from the play store in the future.
If they ever destroy this ability again, for $15/mo. to CallHippo and a data-only SIM, you can send Google, Android, and control on your life by your wireless vendor packing, plus you will have your recording, calling logs, and Voice over Wi-Fi via VOIP anywhere you can get a data connection, plus it is backed up forever. No more number porting, and if something happens to your phone, simply need to buy another phone. The only capability it needs is a data connection, so even a computer, tablet, or SIP phone will work. There are many other advantages as well. Multiple devices can respond to the same number and multiple people can answer and be talking on the same number. The only thing any of them will see is a secure connection to your VOIP vendor.

IT, thanks for this detailed post. I just want to clarify something you might want to update. Ramifications #3 for migrating to U1: wifi calling DOES work on T-mobile (but not volte), and it sounds great!

gruuvin said:
IT, thanks for this detailed post. I just want to clarify something you might want to update. Ramifications #3 for migrating to U1: wifi calling DOES work on T-mobile (but not volte), and it sounds great!
Click to expand...
Click to collapse
Thank you for the feedback. I've mentioned before on other threads that T-Mobile users are the only ones talking about Wi-Fi calling working on the U1 firmware, but I forgot to include that here. I will add than now.
However, I do have a few questions:
1. Did you flash the T-Mobile U1 firmware or the US UNLOCKED?
2. How did you activate Wi-Fi calling? Did it just work, or is there a place in the Interface in the T-Mobile U1 Firmware to put in your address?
3. Why do you believe that VoLTE is not working? VoLTE is digital voice, as is SIP/VOIP, Wi-Fi Calling/VoWiFi. VoLTE is part of the LTE protocol suite that came with LTE-A, which has been implemented on phones since the Note 4. An LTE network is a data-only wireless network just as the Internet's IP network is a data-only network. Voice cannot travel either network unless it is digitized. Wi-Fi calling (VoWiFi) requires a service at the carrier which negotiates the data stream source with your phone and transitions between wireless and the Internet without dropping the call to your carrier's PSTN server where they host your number. It's tough for me to accept that you have the far more complex VoWiFi without VoLTE. If using connection monitoring software your phone shows only an LTE connection during a call, VoLTE is being used and your nice clear calls are no mystery.
Thanks!
PS: There is only so much practical spectrum suitable for cell phones. In the US it is the FCC's job to responsibly manage the growing demand for that space. When carriers want to license bands from the FCC, there are ALWAYS catches. They made Verizon share a band with T-Mobile. Verizon and Sprint are not shutting down CDMA on their timeline, it is on the FCC's timeline for some deal they made that is part of their band licenses because it frees up those bands for LTE.(Verizon EOY 2019 and Sprint EOY 2020) Similarly, providers are telling customers that they will not support phones on their network without HD Voice/VoLTE (Added with LTE-A) past...(Verizon EOY 2019). They will GIVE you a phone, and maybe even tape money to it, to get your old phone off and keep you as a customer. The FCC isn't allowing them to suck up bands that can only be used for analog voice calls. Carriers cannot do carrier aggregation that way either to where they can balance traffic across multiple bands so they don't have some over utilized while others are under utilized. LTE-A Rel. 10 of 2011 already enabled up to 5 bands to be aggregated up to 100 mbps. For carriers like Verizon it is panic. They know there is no point in approaching the FCC for anything unless they can prove they've optimized what they have. The T-Mobile and Sprint merger is a beautiful thing. It's like sewing a head onto a body.

IT_Architect said:
1. Did you flash the T-Mobile U1 firmware or the US UNLOCKED?
2. How did you activate Wi-Fi calling? Did it just work, or is there a place in the Interface in the T-Mobile U1 Firmware to put in your address?
3. Why do you believe that VoLTE is not working?
Click to expand...
Click to collapse
1. I've read that U* firmware is carrier-specific, here in the USA, except for U1, which I have, which is USA unlocked and unbranded (no carrier). I bought the phone new with U1, un-branded, no carrier firmware, so I did not flash anything. It came with Android 8 and I immediately let it do all of its updates to bring it forward to Android 9. I think that was in June. So, no, not T-Mobile. U1 unlocked. (Love this--very little bloat, and I've used adb to disable some apps as well, namely that FaceBook TRASH)
2. There is no access to Wi-Fi Calling in the settings, however there is a Wi-Fi Calling toggle in the toggle drop-down, and I've confirmed that it indeed does switch Wi-Fi calling on and off, by walking in and out of my home wireless area while in a call and watching the Wi-Fi icon on the call screen appear and disappear and hearing the quality become very clear when on Wi-Fi calling and get less clear when switching to the carrier network.
3. I am not sure about VoLTE, because there is no toggle or VoLTE setting in settings. I had never really tested it or cared, but I just now tried a test. I downloaded the "LTE Discovery" app to see the band my phone is connected to, in realtime. I am on LTE band 4. I am at home and connected to my internet over wifi. I placed a call to my wife, and it was going over my wireless (wifi icon in call screen). Not the right condition for this test, so I turned off my phone's wifi. I then placed the same call, confirmed his call was not over wifi (and must be over the carrier network) and switched over to the LTE Discovery app to see if it had connected to a non-LTE band for the call. It was still connected to the LTE Band 4 that it was connected to before the call. I might assume this means that VoLTE worked. Even still, I don't know how to test further, since there doesn't appear to be anything that allows me to turn VoLTE on or off. Nothing in settings or no toggle in the toggle drop-down. One thing that make me hesitate to fully believe that that test call was VoLTE is that I believe Band 12 is the only band that is LTE-ONLY..... if I could make a voice call while on that band, then I think VoLTE must have been working (?). But I don't know if the LTE Discovery is doing a great job of connection monitoring for Band 4... I mean, is it possible it would show LTE Band4 while placing a voice call and switching to a non-LTE connection? I don't know.
Hope that helps!
Also, thanks for the intro to VoLTE. That helped me understand VoLTE better.

gruuvin said:
...I immediately let it do all of its updates to bring it forward to Android 9.
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Click to collapse
I'm on 8.1 because we need it for call recording purposes.
gruuvin said:
There is no access to Wi-Fi Calling in the settings, however there is a Wi-Fi Calling toggle in the toggle drop-down, and I've confirmed that it indeed does switch Wi-Fi calling on and off, by walking in and out of my home wireless area while in a call and watching the Wi-Fi icon on the call screen appear and disappear and hearing the quality become very clear when on Wi-Fi calling and get less clear when switching to the carrier network.
Click to expand...
Click to collapse
That's interesting. I'm on Verizon U1 US UNLOCKED connected to Wi-Fi and don't have it, but that's not a surprise. It would be interesting to see if it works on T-Mobile U1 8.1 US UNLOCKED or U1 8.1 T-Mobile. My guess is if T-Mobile, if it works with 9.0 it will work with 8.1 since phones have supported Wi-Fi calling for a long time. It would also be good to know your build number from About Phone/Software Information and what it shows in Service provider SW ver. in ???/???/???.
gruuvin said:
I turned off my phone's wifi. I then placed the same call, confirmed his call was not over wifi (and must be over the carrier network) and switched over to the LTE Discovery app to see if it had connected to a non-LTE band for the call. It was still connected to the LTE Band 4 that it was connected to before the call. I might assume this means that VoLTE worked.
Click to expand...
Click to collapse
If you go to the menu and select "System Network Setting" it will show you hidden screens and show you if VoLTE is turned on. If you go into System Info/Feedback, you can learn quite a bit about your phone that doesn't display in settings. Is Worldphone set to True or False? It would be interesting to see what Network Cell Info Lite shows on the Device-SIM tab in the Device Telephony area, and what shows on the RAW tab when you are in a call with Wi-Fi on and off during a call. Where I'm at LTE is inescapable. You can learn a lot by using Network Cell Info in concert with Force 4G LTE which can force any band, not just 4G LTE. Set it at some old supported protocol for your network in Force 4G LTE, and make sure Network Cell Info shows what you set it to. Then switch back to Auto and see that it returned to the default. That will give you confidence that Network Cell Info is showing you what is actually going on when you make a call. Eh...conversely, when you are finished playing around, make sure you set Force 4G LTE back to Auto, and confirm in Network Cell Info.
Thanks!

IT_Architect said:
I'm on 8.1 because we need it for call recording purposes.
That's interesting. I'm on Verizon U1 US UNLOCKED connected to Wi-Fi and don't have it, but that's not a surprise. It would be interesting to see if it works on T-Mobile U1 8.1 US UNLOCKED or U1 8.1 T-Mobile. My guess is if T-Mobile, if it works with 9.0 it will work with 8.1 since phones have supported Wi-Fi calling for a long time. It would also be good to know your build number from About Phone/Software Information and what it shows in Service provider SW ver. in ???/???/???.
If you go to the menu and select "System Network Setting" it will show you hidden screens and show you if VoLTE is turned on. If you go into System Info/Feedback, you can learn quite a bit about your phone that doesn't display in settings. Is Worldphone set to True or False? It would be interesting to see what Network Cell Info Lite shows on the Device-SIM tab in the Device Telephony area, and what shows on the RAW tab when you are in a call with Wi-Fi on and off during a call. Where I'm at LTE is inescapable. You can learn a lot by using Network Cell Info in concert with Force 4G LTE which can force any band, not just 4G LTE. Set it at some old supported protocol for your network in Force 4G LTE, and make sure Network Cell Info shows what you set it to. Then switch back to Auto and see that it returned to the default. That will give you confidence that Network Cell Info is showing you what is actually going on when you make a call. Eh...conversely, when you are finished playing around, make sure you set Force 4G LTE back to Auto, and confirm in Network Cell Info.
Thanks!
Click to expand...
Click to collapse
Gonna read through this and respond in a sec, but I came back to this thread to report something I found. Using QuickShortcuMaker, I was able to find and launch "com.android.settings/com.android.settings.RadioInfo". This gives a bit of interesting output and lets me toggle "Wi-Fi Calling Provisioned" and "VoLTE Provisioned". I have previously hunted for VoLTE in the settings menus quite exhaustively and never found anything, so this is great (also, both were toggled on). There is also a "Video Calling Provisioned" toggle, but it's grayed out.
Software Info screenshot attached.
So, "System Network Setting" and "System Info/Feedback" are not in settings men, so you'll have to give me a hint where to find these, because I don't know what menu you were referring to.
Trying the "Network Cell Info Lite" app now. Ahhhhh, there's the "System Network Setting" menu you referred to.
And going there only takes me into my android settings "Mobile networks" menu with no hidden anything. I'm fairly sure this has to do with the csc I have for the unbranded U1 rather than carrier branded csc. CSC controls what gets shown in menus. I went through this with my S7 Exynos version when trying various cscs and even modding my own to force wifi calling and volte.
On to "System Info/Feedback". I'm attaching a screen shot of that too.
Okay. I installed Force 4G LTE. Great tools! I'll good advice. I'll go play now.
Side note: I write backend software for sustaining a nationwide fiber transport and ip layer backbone, and I'm a stickler for engineers being precise, accurate, and thorough. Well done, IT!

Oh one more thing. Screenshot of com.android.settings.radioInfo

Allowed Network Cell Info to read phone state. World phone = false
Uhhh... I just kinda realized. This is hijacking your thread.

gruuvin said:
Oh one more thing. Screenshot of com.android.settings.radioInfo
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Click to collapse
GET THIS THUMBNAIL OFF OF HERE QUICK!!! It has your IMEI number on it.
The thread is about call recording and of which preventing migration to Pie by using U1 firmware is required. Any way that can also restore Wi-Fi calling on U1 firmware is what everyone wants. Using the U1 firmware with the T-Mobile SIM works, but it is also needed for Verizon and others where that doesn't work.

thanks.. ya i meant to scroll my screen up a bit more to cover my phone number and imei.... it's getting late, and I should probably get off the interwebs.
went and read up on what someone could do with my imei....
anyhow... I installed "Force 4G LTE" by DevAppliance, and maybe that's not the app you were referring to... it didn't seem to do what you suggested.... and there does seem to be a few apps out there that match that name... what's odd is by clicking on the one of two options, the one that should have let me force 4g... it loaded the com.android.settings.radioInfo I had originally come back to this thread to report... the one that actually shows the hidden VoLTE and WiFi Calling Provsioned toggles (and yes the one I screenshotted of my imei, ughh). What are the chances? Really odd!
Oh, and then I uninstalled it, because it's basically useless, besides tons of junky ads.
So what's the developer that makes the Force 4G LTE you referred to?

gruuvin said:
I installed "Force 4G LTE" by DevAppliance, and maybe that's not the app you were referring to... it didn't seem to do what you suggested....So what's the developer that makes the Force 4G LTE you referred to?
Click to expand...
Click to collapse
I posted a bad link and just now corrected it.

btw U1 or any U firmware are muti csc. so i a sense even if you have never flashed a crarrier branded frimware, their CSC is still in the odm partition part of your device. the bloat apps arent on U1 of course. now the question is how are they able to ascertain if u are on U1 or not. because at this point it is not the blacklisting of the imei on non carrier bought device from using advanced csc features as people with U carrier bought phones have reported that after flashing U1 they have either WFC or volte not working( or in some cases both).

bober10113 said:
btw U1 or any U firmware are muti csc. so i a sense even if you have never flashed a crarrier branded frimware...now the question is how are they able to ascertain if u are on U1 or not.
Click to expand...
Click to collapse
1. I'm going to toss out VoLTE because just because people say it isn't happening, doesn't mean it isn't. I've proven in a couple of instances now. If they call and only LTE is active during a call, it HAS to be using VoLTE. LTE cannot pass voice any more than IP can without it being digitized. IMO the FCC wouldn't allow carriers to communicate with LTE-A phones where they have an LTE-A network available, even if they wanted to.
2. IMO, Wi-Fi calling is the only one left standing and that we can prove only works on the U1 firmware for T-Mobile and Sprint. On the same phone, if you insert in a T-Mobile SIM your have Wi-Fi calling, and if you insert a Verizon SIM it goes away. Network Cell Info Lite shows this in the attachment that VoWiFi and ViLTE are not available with the U1.
3. When we flash Verizon's carrier-specific firmware, ViLTE and VoWiFi are available, once you fill in an address, VoWiFi must actually be standard SIP/VOIP because it makes no sense for a cell phone to have an address and an address is a VOIP requirement.
4. When you flash ANY carrier specific firmware, the the Blue Software Update icon does not show nor does ADB have access to it. USERDATA also implements the Security Policy of the carrier.
5. The next question is can VoWiFi and ViLTE be turned on remotely without a firmware upgraded. If I were to guess, I'd say yes. I already found the VoLTE hidden screen Network Cell Info Lite and I'd guess that Wi-Fi Calling is also in the base firmware that can be activated, and because it would make good business sense to be able to activate it on all devices from a flag change in a central location. When USERDATA is present, it references that. I base this on the fact that T-Mobile and Sprint activate VoWiFi and Verizon does not when no USERDATA is present.
Just a guess,
Next questions:
1. Referencing the attached picture, what determines whether or not a phone is a world phone? It's carrier unlocked and has more bands than any other phone but states it is not a world phone.
2. Do US phones incur limitations on non-US networks if they support the proper bands?
3. Do "world phones" work on US networks?

For those with a U1 unbranded variant who cannot load com.android.settings.radioInfo from their Settings menu, you can can just create a shortcut using Nova Prime launcher or some equivalent. You can use it to turn on/off Wi-Fi Calling and VoLTE. You can also use it to force your radio to connect to different bands, with more control than you get through Settings > Mobile Networks. You do not need a special app like "Force LTE Only" to do this.
Just make a shortcut to com.android.settings.radioInfo, also labeled "Device info".

gruuvin said:
Just make a shortcut to com.android.settings.radioInfo, alse labeled "Device info".
Click to expand...
Click to collapse
I'm on the latest 8.1 U1 with Verizon SIM installed and I do not have that. What are you on?

IT_Architect said:
I'm on the latest 8.1 U1 with Verizon SIM installed and I do not have that. What are you on?
Click to expand...
Click to collapse
9. When was the latest 8.1 released? Security patches?

gruuvin said:
9. When was the latest 8.1 released? Security patches?
Click to expand...
Click to collapse
The build date is 2018-12-14 - N960U1UEU1ARL1 and with the Verizon SIM installed, which makes a difference too. If you make no other changes other than plug in a T-Mobile or Sprint SIM, Wi-Fi Calling will appear before your eyes in real time.

US Note 9 Carrier-Specific vs. US Unlocked Firmware Observations & Theories moved to new thread

gruuvin said:
9. When was the latest 8.1 released? Security patches?
Click to expand...
Click to collapse
Hi gruuvin,
This thread and the one it references is by and for users who need to remain on Oreo 8.1, and this thread in particular, focuses on regaining usable call recording abilities. Android 9.0 Pie cannot do clear call recordings, and the spring 2019 Google play store policy update has destroyed people's ability to have the usable call recordings that has affected phones at least back to KitKat. These surprise malware attacks have wiped out not only the ability to to have meaningful call recording going forward, they have also destroyed previous records that they used as the a basis and proof of service for their invoicing. To us it is worse than ransomware because you can't even pay the ransom. It has also been people's automatic note taker for projects so things don't get missed, and the basis and backup of invoicing for professionals who invoice for their time. Some simply used it to not have to interrupt the flow of the conversation to write notes, and especially while driving. Moreover, often you do not know when the conversation is held if it's details will become significant later. People have been relying on this ability for many years and it was the deciding factor when choosing between Android and the iPhone. If they could use Android 9 Pie, and trust Google play store policy updates, they would not have flashed from their carrier's U firmware to U1, and investigating the possibility of a work-around to regain Wi-Fi Calling. At the moment, the only networks I'm aware of that support Wi-Fi Calling using U1 firmware's native abilities are T-Mobile and some indicate Sprint as well. This MAY be because they got into it early and as a result do not have a standards-based implementation, and must be handled by the carrier's USERDATA in the U firmware.
Thanks!

VoLTE and Wifi Calling support

Would like to know if these features are supported for the major US carriers. That's the only thing holding me back from pre-ordering.

gordec said:
Would like to know if these features are supported for the major US carriers. That's the only thing holding me back from pre-ordering.
Click to expand...
Click to collapse
I know U.S. T-Mobile supported the XZ3 for VoLTE, which was the FIRST Sony unlocked phone it did that for. Your best bet to find out is prob to go check out other like 2019 or 2020 unlocked phones that people have VERIFIED to offer both on AT&T as well. But if that's an issue, then you may wanna consider T-Mobile then. I noticed on the XZ3 that in Call Settings there no longer was the option to turn VoLTE on or off, but during calls it REMAINED in 4G LTE (vs. just 4G), thereby proving VoLTE was in fact enabled.

The US Xperia 1 supported voLTE on T-Mobile, but not WiFi calling. So I'm assuming the mark II would at least do voLTE on T-Mobile. Not sure about the other carriers, but I feel like it would have to since carriers like Verizon are starting to not allowing non voLTE devices to be activated. And the mark II is supposed to work on Verizon.

Easy way to get WiFi calling in the US
https://forum.xda-developers.com/xperia-1/how-to/easy-to-wifi-calling-t4100229

Scorpiusest said:
https://forum.xda-developers.com/xperia-1/how-to/easy-to-wifi-calling-t4100229
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Click to collapse
How is this a solution? Switching carriers lol

I want to preorder, but really need WiFi calling. Going to wait until regular users start to receive theirs. Right now with Xfinity Mobile we are paying about $30 per month for 5 lines. The service is as good as when we were Verizon postpaid. Not willing to switch just for this phone.

Anyone in the UK on O2 get it?

Rodders_28 said:
Anyone in the UK on O2 get it?
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Click to collapse
Yup, got both (see attached)

I have none of those settings there.
I also don't get 4g+ don't know if that's related?
I get 4g+ if I put the missus Vodafone sim in.

Rodders_28 said:
I have none of those settings there.
Click to expand...
Click to collapse
I should have mentioned also that I'm actually on the "Customized UK" firmware opposed to the "O2 UK Pay Monthly firmware" but I had WiFi calling for sure prior to this

So my Xperia 1 ii arrived today, I'm finishing-up set-up. This is the US model, which I'm using with ATT. The deep dive *#*#7378423#*#* on the software info page states: "Current modem config: VoLTE-ATT "
But have yet to find any configuration for VoLTE or Wi-Fi calling. I'll try a call with one of the other lines in my family, who have ATT branded newish phones, to see if it "sounds" like an HD Voice call (there's not notification bar indicator of HD call, right?).
Update: Tried the other *#*#4636#*#* and the options under Phone Info are all grayed out (sigh)

JamesMiami said:
So my Xperia 1 ii arrived today, I'm finishing-up set-up. This is the US model, which I'm using with ATT. The deep dive *#*#7378423#*#* on the software info page states: "Current modem config: VoLTE-ATT "
But have yet to find any configuration for VoLTE or Wi-Fi calling. I'll try a call with one of the other lines in my family, who have ATT branded newish phones, to see if it "sounds" like an HD Voice call (there's not notification bar indicator of HD call, right?).
Update: Tried the other *#*#4636#*#* and the options under Phone Info are all grayed out (sigh)
Click to expand...
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You have to call ATT to whitelist your new IMEI for VoLTE provisioning. Then you need to make sure a new sim that supports VoLTE. This is what they told me but I'm missing the new sim, going to get one tomorrow

Thank you.,I'll give that a try. My SIM is the supposedly latest, about 2 years old, i. e. "A compatible SIM or eSIM card will display 25, 26, 27, or 28 in the ninth and tenth digits spots." Is there a newer SIM for ATT?

So had the following chat with ATT tech support:
"... Calista : To confirm, was the device purchased through AT&T?
Me : No, this is an unlocked phone, US model of Sony Xperia 1 ii
Calista : Thanks for the confirmation.
Calista : I have successfully activated VoLTE on the new device.
Calista : I have also checked and see that Wi-FIi calling can only be provisioned only on the device that are purchased through AT&T. However, AT&T will soon activate WiFi calling on the device that are not purchased through AT&T as well. You will be notified about this. "
However after power-cycling my phone and reprovisioning via Testing/Phone Information and on that page the steps of Refresh to get the SMSC number then tap Trigger Carrier Provisioning"--nothing, not VoLTE live switch. Remains gray. Still, interesting comment by tech support about upcoming Wi-Fi calling on BYOE.

Anyone know about VoLTE on Verizon yet? Just ordered my phone today and hoping that it will work.

JamesMiami said:
So had the following chat with ATT tech support:
"... Calista : To confirm, was the device purchased through AT&T?
Me : No, this is an unlocked phone, US model of Sony Xperia 1 ii
Calista : Thanks for the confirmation.
Calista : I have successfully activated VoLTE on the new device.
Calista : I have also checked and see that Wi-FIi calling can only be provisioned only on the device that are purchased through AT&T. However, AT&T will soon activate WiFi calling on the device that are not purchased through AT&T as well. You will be notified about this. "
However after power-cycling my phone and reprovisioning via Testing/Phone Information and on that page the steps of Refresh to get the SMSC number then tap Trigger Carrier Provisioning"--nothing, not VoLTE live switch. Remains gray. Still, interesting comment by tech support about upcoming Wi-Fi calling on BYOE.
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Those tech support chats are useless! Took me 4 calls/chat to get to one knowledgeable one who said they have to file a level 3 tech support ticket and as she was doing it she said our internal memo said this cannot be done for non-AT&T branded phones so I'm sorry

Why not just use Google Voice for wifi calling? I use Google Voice for just about everything now as it's a nice alternative to giving up my number to random businesses.

Is it possible, to install the VoLTE/VoWifi carrier settings by an app (as .apk)?
My problem is that Sony didn't include these settings for Swiss carriers. So I am thinking about, how to add these settings without breaking the firmware.

YandereSan said:
Why not just use Google Voice for wifi calling? I use Google Voice for just about everything now as it's a nice alternative to giving up my number to random businesses.
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VoLTE is required to continue to use AT&T after they sunset 3G and 4G (without VoLTE). Speaking of Google, they've confirmed to me that this phone (US version) works fine on their Google Fi, supporting VoLTE, which is interesting in that Google Fi is an MVNO via Sprint, T-Mobile, and U.S. Cellular.

So if I give ATT an IMEI for a Nokia Lumia 830 or Microsoft Lumia 640XL (both on AT&T's "good" list) to associate with my SIM in my Xperia, will my Xperia be provisioned by AT&T with VoLTE & Wi-Fi calling?