Dual Sim issues, can't make calls on sim1 when sim2 is inserted - Huawei P10 Questions & Answers

Hi,
I rebranded my VTR-L09 to L29 two years ago.
Since then I use the dual SIM functionality nearly every day at work.
SIM1 is my private card, SIM2 is my work card.
Both are in the same network (Vodafone DE) but different providers (SIM1 is 1und1 and SIM2 is Vodafone).
Since some days I'm not able to make calls with SIM1 when SIM2 is inserted.
When I try to make a call while SIM2 is active, the phone app switches automatically to SIM2 without asking.
When I disable SIM2 in Dual SIM settings, I get the message "Mobile network not available" (translated) when I try to make a call.
When SIM2 is removed I can make calls without any issues.
Internet (HSDPA+ and lower, LTE is not available in my contract) and receiving calls is still possible and without any issues even SIM2 is active.
In dual SIM settings the standard SIM for calls setting is disabled, but even if I set it to SIM1 the calls will go over SIM2.
I already called my provider and I will get a new sim card but I doubt that this is the issue.
Does anyone knows this and is there a fix for this?
I'm on C432 B376 by the way, and there's no update available for me, yet.
My phone is also rooted.
A factory reset would be very annoying since it takes extremely long time to back everything up.
Greetings,
Jannomag

I also have rebranded my VTR-L09 into VTR-L29, but I have no dual SIM issues. Build number 376 (C432). What happens if you swap the SIMs?

The same issue, but inverted. The phone switches to my companies sim card automatically.
Is it possible that the network provider block this standby dual sim thingy?
I received my new sim card but it still doesn't work.
A few days ago I installed Google's phone apk as a second phone app for my second sim, because I wanted to seperate my private and companies contact lists. This didn't worked as I expected and I completely removed it and deleted cache and dalvik via TWRP.
Maybe the issue was produced by this, but how do I remove it?

It sounds like a plausible explanation. If that is the case, I am afraid the only thing that will help is a factory reset, unless you figure out what changes were made by the google phone app.

I did a factory reset...took about 5 hours to get everything like it was before.
Even with TB some apps don't work good (WhatsApp for example, needed to reinstall it...but somehow the backup from yesterday was gone, so I got a throwback to last week).
Now I can make calls again as usual. Strange behavior...

It looks that google dialer apk messed something in your phone. good to hear,that all is ok now.
I am also rebranded VTR-L09 to VTR-L29 year ago. I am on C432 B379.
both SIMs are on Vodafone network and everything works as it should (SIM1 - private+data enabled, SIM2 - work+data disabled).
I am on stock firmware, no root, stock dialer. @Jannomag : 5 hours?Really? I made factory reset two months ago (backup trough huawei backup) and it was matte rof 1 hour. Of course i have to sign in to FB,Whatsap,instagram...

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Note 5 at&t emergency calls only issue.

Hello. About a 4 months ago i have bought from eBay a note 5 at&t version. I live in Greece and my network operator is WIND GR. The phone works fine but from time to time i get an emergency calls only message. And i can't get and do a phone call. If i restart the phone everything goes to normal. Sometimes it goes on and off by itself (the problem).
Have been anyone experiencing the same issue? If the phone is incompatible with my network operator should it not work at all?
Did you tried to change the sim card? Maybe issue is from sim or from sim slot
johnny.goldy said:
Did you tried to change the sim card? Maybe issue is from sim or from sim slot
Click to expand...
Click to collapse
My sim is new. When i purchased the phone i have changed my old sim with a new sim 4g compatible.
It happened again. And i am missing calls like this. I will smash it with a hammer
Go to settings, backup and reset, then reset only network settings, see if any better signal
johnny.goldy said:
Go to settings, backup and reset, then reset only network settings, see if any better signal
Click to expand...
Click to collapse
Done that right now. Tomorrow i will get a new sim card and i will post if anything gets better. Thanks for the help.
Update of the situation. I have changed sim card 2 times. It still happening. My phone runs at nougat now and the problem still appears as before at 5 and 6 Android version. I currently gonna change service provider that has better and stronger signal. From what i have discovered. When the phone looses signal due too poor service provider signal sometimes it can't register to network by itself. If i enable airplane mode and then turn it off it comes back. Any clue? If it's hardware issue what can i change?
Should i have at the mobile networks auto detect or manual and my carrier?

Dual Sim Data Questions

Hi,
Got the note 9 since friday. working great. but i noticed that when i call on sim2, i can use mobile data of sim 1.
Default mobile data is from sim1. and phone calls are set to ask every time.
now my sim2 is my work number. during the working hours i call alot with this number.
my sim 1 is my private sub from t-mobile. and i mainly use the data plan of it. since i dont wanna use the internet that my boss pay's for for my personal use.
Now since i got this setup. what happends is. some one texts me a foto through whatsapp. and then calls me to sim2 before i can look / dowload the picture. then when i pickup the phone they ask me did u see the picture i sent you. i then open whatsapp. but i get the msg no network.
what i noticed is that when i call on sim1 i still have LTE data. (cause sim1 provides the data)
so it cant use data from sim 1 and voice from sim2 at the same time?
also is there a way to set certain apps to use data of a specific sim card?
lets say i open my 2nd whatsapp that it loads the images sent there from my sim2 network
but when i open my 1st whatsapp (2nd app cloning) it uses data from sim1?
or any other apps for exmp chrome and samsung internet?
is there any tweak that automates the switch data to sim2 as soon as i make a call with sim2?
now i can just click on the sim settings menu and change the default data to sim2 to receive data during the call. but when im driving in my car this are alot of buttons to press and i rather not.
i don't own N9 yet. read about dual sim technology varieties on the net, theoretically N9 should be able to get dual VOLTE feature on both SIMs (assuming it supported by carrier(s), and phone shows VOLTE icon on both SIMs). in the event you are making call on SIM 1 & trying to get data on SIM 2 or vice versa, this requires dual sims dual volte (DSDV) feature kicks in and liberates you to choose which SIM to get data from.
might really want to consult with your carrier(s) if both SIM support VOLTE.
Are you able to get VoLTE and WiFi calling to work on the international dual sim F variant of Note-9 on US T-mobile network?

Sim Selection unavailable

Hi I have a Nokia 8 (TA-1004) which is dual sim.
I have a 3 sim and a plus net sim installed.
When I select the default sim for data it works, same for messaging.
BUT when I open the selection for calls i cannot change it from "ask every call" to either of the sims though it looks like it should be possible.
Anyone come across this before? what is the answer? phone is latest OTA updates.
Nokia 8 not permitting selection of preferred sim for calls
Hello I have exactly the same problem as described below by Pontprennau. Also on a Nokia 8 (TA-1004) in the Network & Internet screen under "SIM cards" and then "Calls". Setting preferred sim for sms and data are permissable for both Sim 1 and Sim 2, but setting the preferred sim for calls is not permissable and continuously force-defaults back to the "Ask every Time".
Can't imagine that the network provider has anything do with this problem though ie whether it is a T-Mobile, 3 or any other network.
If any information/resolution on this are available would be much appreciated. I have the latest OTA updates provided by Nokia/HMD Global.
Thanks
Pontprennau said:
Hi I have a Nokia 8 (TA-1004) which is dual sim.
I have a 3 sim and a plus net sim installed.
When I select the default sim for data it works, same for messaging.
BUT when I open the selection for calls i cannot change it from "ask every call" to either of the sims though it looks like it should be possible.
Anyone come across this before? what is the answer? phone is latest OTA updates.
Click to expand...
Click to collapse
I had same problem in Oreo, but Pie update fixed it.
Sim selection option available in call settings not in sim settings

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I have S10 bought in UK dual sim. I have two sim inserted slot one UK and slot two foreign sim. They both were working fine until recently.
For the last two weeks both have started loosing connection to network. It is for few seconds 5-10 times a day. Initialy this was with foreign sim and this morning the same happened with the UK sim.
I have tried all options in sim card manager, mobile networks and to restart the phone. Still the same.
I have dropped phone twice but this was some time ago so I do not think this is related.
Anyone have experienced something similar on any suggestions how to fix it?
Many thanks
Sent from my SM-G965F using Tapatalk
Yes, I keep losing data connection. I have bars but no data, I have a U.S. sim and a UK sim. Sometimes turning on/off airplane mode helps, other times I have to restart the phone only to get yet another annoying notification telling me I have no network connection. I just installed the latest update, we'll have to see if it stops.
I was decided to do factory reset as a last resort but I thought that maybe I will start with other options and I did the Reset network settings.
So far all good. For the last two days no single issue with loosing network connection.
Sent from my SM-G965F using Tapatalk

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Hello. I have find X5 pro.i have trouble with dual SIM active. Two Sims working fine except during calls. While talking on sim1 SIM 2 it's deactivated untill call it's finished exactly same is other way. I have waiting calls notification but when I talk on SIM and someone want reach me on same SIM card. SIM cards are perfect because on my old phone (Huawei p40 pro) works perfect. How can I fix that problem? I need to get two Sims active all the time for my business

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