N960U Notifications not working correctly consistently - Samsung Galaxy Note 9 Questions & Answers

Hi all,
Phone: N960U from T-Mobile, 128GB version.
I am by in large not getting notifications unless I open any given app, then I receive all notifications for the given app instantly.
Exception seems to be SMS messages.
This also seems to be impacted by my cell coverage, as the issue happens more at work where my cell service is poor, but we have strong wifi which I automatically connect to.
For example, someone sends me a message in Signal, I won't get any notification until I open Signal. However, if someone sends me a text message, Signal will present that SMS notification right away, but not message notifications even if they are waiting.
Same situation applies for anything that is data backed (email, browser, etc.) I say data because I know SMS is not handled the same way as data. I also do get notifications for things like reminders, phone calls (not sure that's a notification), and other non network related situations.
I am not using any power save modes and have exhausted all my google search finds of enabling/disabling different kind of notification settings.
My phone is not set to do not disturb either.
It almost seems like when the screen is off, I am losing data connectivity which is causing the apps to not update, but I would expect them to update when the screen turns on. Instead I have to manually open the app to trigger the sync.
Anyone have suggestions?

These notifications issues all started for me when my note 8 got upgraded to Android 8.0 and continue to be issues on the note 9. Sorry no consolation.
Primarily Telegram and i think what's app.
Sent from my SM-N960U1 using Tapatalk

I've been having issues with notifications in general for a year or so now across a few devices on and before Oreo, WhatsApp is the worst, it doesn't play well with custom ROMs, but even on the note9 pure stock is still a problem, my last ROM on my le eco le max 2 I used to have to lock these apps in the task switcher, I'm not certain if that's an option with the note9, I wasn't getting Gmail notifications either on this but that seems to be okay now I've disabled battery optimisation for it, have you tried that?

Related

[Q] How can I disable "after call summary" ?

These days I’m on vacation using a pre-paid connection. I actaved a data connection on it and started getting these usage summary notifications every few seconds (e.g: Data charge is xx.xx, your available balance is yy.yy, valid until dd/mm/yy). Its really annoying because if I keep the phone locked for like an hour I am presented with 50 odd such messages that I have to press OK before being able to use the phone . When I called the technical support, I was told that it is a phone feature usually called “After call summary” or “call summary”, that can be turned off from the phone itself. Since they don’t carry any android devices he couldn’t help me where to find it. I looked around myself, but couldn’t find anything . Can someone help me with this ? Thanks.
Guess no one knows about this feature or how to disable it?
some one help me with this too..
Hi. I don't think it's a device feature. And if it's a "call summary" then it shouldn't inform about data plan. Try searching for a disabling code on your operator's website.
I have a "call summary" enabled - it pops up after a call, and I can disable/enable it only with a USSD code defined by operator.
Remove Call Summary Screen on Verizon Galaxy 8
I was getting an annoying call summary screen on my Galaxy 8s. It appeared to have the green android messaging icon in the call summary and splash screen. I use the Verizon massaging app. I therefore disabled the android messaging app and the issue disappeared. If you have another android, see if you can replace the android messaging app prior to disabling it.

Texts stuck "sending" and other issues

Ok everyone figured I'd come here to where the experts live. Haven't been here in awhile.
Recently my S8, wifes S8, and our sons S8+ all have the same issues.
The first issue is texts get stuck "sending". This happens with WiFi on or off, with wifi calling on or off, and I even tried changing off LTE to just 4G/3G/2G and even 2g in settings to see if that would help. I'm on the latest firmware from TMO ending in QEF, well we all are.
The other one is apps like FB and others aren't alerting but they will show the number of alerts even after they've been checked. I've reinstalled these apps and the problem persists, and then I can reboot my phone or wifes phone and all the alerts start working again for awhile and then die eventually.
The texting issue though persists and is random when it will hang and when it doesn't.
According to TMO rep at the store it's a bug in the firmware with bixpy that was pushed out, but I frankly don't buy it and figured I'd hit the guru's up here and see if you guys have any thoughts.
Thanks in advance guys and gals....
I too have had the random "texts get stuck sending" issue. I haven't had it in a while though (now that I've said that I'm sure I will).
I unfortunately don't have any suggestions.
I ended up using googles version of messages due to this. Only on stock text app do i have any problems anymore. I also noticed on the stock app that my phone would say "sending" when the other side would actually get it, but it was at random.
You don't have a cellspot repeater or router do you? Last time I had it, my device was hung and needed reboots. Just a thought.
Thanks for the feedback, yes I have a cell spot, but I also have the issue other areas of town too with no real specific place thatbit always happens.
I'm going to reverse back from the qef firmware and see if that resolves things. This has been so annoying, and it just started about two weeks ago.
Thanks again everyone.
I have had the same issue with sending texts too. I have been using the stock messenger app. I may just switch to textra.
Same issue here. A temporary fix, try turning on airplane mode and off. Works for me a times
Also happening to me on the XAA firmware (have unlocked NA variant) with the stock messaging and Google messages.
So I'll ask the question begging to be asked (at least by me): How does one disable this messaging app and use "stock messaging" app?
Thanks in advance....
rabilancia said:
So I'll ask the question begging to be asked (at least by me): How does one disable this messaging app and use "stock messaging" app?
Thanks in advance....
Click to expand...
Click to collapse
Just get a app disabler for Samsung from play store like BK Disabler.
If I were you, just download Android Messages. It's simple and fast.
However, I do not recommend disabling stock messaging, unless you don't like getting EAS (Amber/Weather/Presidential Alert)
Having the exact same issues and it's driving me crazy because I really like this phone. I don't get notifications for any of my apps but when I open them I can see the new messages. A reset seems to fix the problem but it only lasts about an hour before it starts doing the same thing. I've tried using different messaging apps but the same thing. And the fact that I don't get notifications for other apps it can't just be a text messaging issue right?
Happened to me for almost 2 months but haven't had an issue in about a week. Called t mobile, they created a ticket and said they'll be working on it. Few days after speaking to them, problem went away.
This has been happening intermitantly for me as well. It's been bad the past three days. I'm currently in coversations with T-mo's engineering team and they seem to be coming up with a bunch of dead ends. It's not a location based thing as it's been happening over a 20 mile radius in the past few days for me. Other people on T-mo network that I'm freinds with or I work with aren't having any problems. I'm wondering if just a fresh SIM card could solve it?
I have data connection although it seems a little sluggish compared to when I originally got the phone. Similar to OP I've tried all the "G's" modes, with wifi calling on, with it off, with cellular network preffered with wifi calling on and off. With Textra, with stock messaging app. I've factory reset to no avail. I've pulled and re-inserted the SIM card to no avail. This is incredibly frustrating for a flagship phone on a network where I've had no previous issues.
UPDATE: T-Mobile sent me a new SIM card and that seems to have cleared up the issues. Not sure if it just hapened to coincide with T-Mo tower fixes or anything else like that in my area but I'm back to normal operation. Anybody else experiencing this I recommend you push customer service to send you a new sim.
my husband and i are having a strange issue where we can message pictures and video clips to other people that don't have the s8, or aren't on tmobile and they'll send and receive just fine, but when we try to send to each other, the first attempt to send fails, but the second attempt goes through?
balthuszar said:
my husband and i are having a strange issue where we can message pictures and video clips to other people that don't have the s8, or aren't on tmobile and they'll send and receive just fine, but when we try to send to each other, the first attempt to send fails, but the second attempt goes through?
Click to expand...
Click to collapse
i had same problem one of you is not using stock message app, if you check it ull find pictures all there i think its new messages plus thing

"READ Tmobile acknowledge Native message app is corrupt. Don't update Says TMobile

"READ Tmobile acknowledge Native message app is corrupt. Don't update Says TMobile
It seems that if you read online on T-Mobile forms in other areas people are not receiving all their text messages if not 10 to 50% of them are missing people are finding this out by logging into T-Mobile digits and same messages they never got through the native messaging app after the 8.0 update.
I noticed this when I did not receive messages for a good while until I put my SIM card into a Galaxy S8 and 20 to 30 messages popped up that were pre conversation topics from the past days before after talking to T-Mobile and digits support team they are being told to replace the device one time and Advising customer to keep the Nougat software until a fix ia found or until further notice this issue seems to be tied to the Z2 only and Oreo update just wanted to throw this out there as a pre warning the alternative solution the tech told me is that you can use a different messaging app but who's to say you'll ever know if you're not getting all your messages .
It evidently seems to be affecting incoming messages alternatively at your own choice maybe Nougat could be flashed back "Not sure" but this is a real life issue for this phone . If you want to be certain and surprised login to T-Mobile digits activate it and see what messages that you have not got
Hope this information is appreciated.
Um check your wifi calling settings
Sent from my [device_name] using XDA-Developers Legacy app
androidddaaron said:
It seems that if you read online on T-Mobile forms in other areas people are not receiving all their text messages if not 10 to 50% of them are missing people are finding this out by logging into T-Mobile digits and same messages they never got through the native messaging app after the 8.0 update.
I noticed this when I did not receive messages for a good while until I put my SIM card into a Galaxy S8 and 20 to 30 messages popped up that were pre conversation topics from the past days before after talking to T-Mobile and digits support team they are being told to replace the device one time and Advising customer to keep the Nougat software until a fix ia found or until further notice this issue seems to be tied to the Z2 only and Oreo update just wanted to throw this out there as a pre warning the alternative solution the tech told me is that you can use a different messaging app but who's to say you'll ever know if you're not getting all your messages .
It evidently seems to be affecting incoming messages alternatively at your own choice maybe Nougat could be flashed back "Not sure" but this is a real life issue for this phone . If you want to be certain and surprised login to T-Mobile digits activate it and see what messages that you have not got
Hope this information is appreciated.
Click to expand...
Click to collapse
seemles said:
Um check your wifi calling settings
Sent from my [device_name] using XDA-Developers Legacy app
Click to expand...
Click to collapse
What about it ? Wether on wifi calling or not this is a message issue acknowledged and very pronounced In many ways . It's simple to see with a few trial and error tests regardless of wifi
Or LTE Data
Seeing all your messages show up on TMO digits comparing them to messages you've got or never got .....putting a SIM card in a different phone and seeing multiple messages pop up that have still been trying to push through that are tied to specific time line conversations. TMobile literally already acknowledges this it's just nobody is realizing it because they're not expecting messages that they're actually missing from people.
Feel free to test it if you would like have multiple people text you wait for it to come through not saying it affects everybody T-Mobile did tell me that they already have a ticket out for it and it's software related to this particular phone.
On top of the SMS of all things is one of the most critical uses of a phone .
Just trying to shed light on a rising issue that most would never be aware of .
Because all Android phones ship with settings set to wifi preferred wich leads to dropped calls and unsent messages after setting up a home wifi. And if you have no sim installed your obviously using wifi calling wich is most definitely not as dependable as volte.
Sent from my [device_name] using XDA-Developers Legacy app
seemles said:
Because all Android phones ship with settings set to wifi preferred wich leads to dropped calls and unsent messages after setting up a home wifi. And if you have no sim installed your obviously using wifi calling wich is most definitely not as dependable as volte.
Sent from my [device_name] using XDA-Developers Legacy app
Click to expand...
Click to collapse
I'll look into that....but if your not on wifi calling "connected" to a wifi network you would still be using volte right ? This is happening to people conversating anywhere Mobily in a vehicle not on wifi. Messages for instance with my brother whereas I never got a reply in which I would have came through after I put my SIM in my s8.
People are seeing ungotten messages in TMobile digits.
I don't really care i was just looking out for the community here with a potential problem hindering, and T-Mobile tech support made acknowledgement about it . I highly doubt a community across United States all at once is screwing up by keeping WiFi preferred on.
You're only going to be using WiFi calling if you're connected to an actual at work under that settings menu otherwise you would be using cellular by default just like it says to choose below that
You're only going to use Wifi calling if you're connected to a WiFi network otherwise you're going to use cellular default which is the same as being on cellular by default correct me if I'm wrong
Can you post a link to the discussion? I can't find anything after searching for a while.
Sent from my [device_name] using XDA-Developers Legacy app
Z2 force sms MMS broken discussion link
http://support.t-mobile.com/thread/143284
Multiple replied posts from z2 users
How this has not made it to xda is beyond me but it is real situation
It's really not a good feeling to really not know all the messages you should be getting that you're not especially the ones that you're not expecting the scenario is playing out just like it shows in these support forums and with myself.
It's like not "Some messages are blocked in a limbo status never reaching the target device
Like myself you could stick a SIM card potentially in another phone and see stuff that pops up that was related to conversations long ago that you never got replied too.
I haven't had much of a problem with T-Mobile to T-Mobile network SMS but many other people I know that use other carriers I never got replied to until I stuck my SIM card into a different phone of mine.
It's a janky situation and if TMobile is already acknowledge this and told to replace phones one time then evidently the issue has gotten out to the people that needs to I just don't know how nobody here on XDA knows about this .
I have tried multiple text apps and nothing seems to be different I even thought about editing access point but usually that only solves MMS problems
This issue was already addressed with a fix to boot by xda. I had the issue my self. With no issues after I updated to oreo.
https://forum.xda-developers.com/z2-force/how-to/t-mobile-how-to-3rd-party-sms-apps-root-t3661703
seemles said:
This issue was already addressed with a fix to boot by xda. I had the issue my self. With no issues after I updated to oreo.
https://forum.xda-developers.com/z2-force/how-to/t-mobile-how-to-3rd-party-sms-apps-root-t3661703
Click to expand...
Click to collapse
I tried this method and it did not work, after the Oreo update I tried again but kept having issues. Decided to Force stop the CPS app and install the Google Carrier services app and this worked. Don't remember where I heard/read about Google carrier services. BTW using Googles messages app now and seem to be receiving all messages.
I discovered this a few weeks ago then installed google messages and everything works now
Missing messages FIXED
androidddaaron said:
It seems that if you read online on T-Mobile forms in other areas people are not receiving all their text messages if not 10 to 50% of them are missing people are finding this out by logging into T-Mobile digits and same messages they never got through the native messaging app after the 8.0 update.
I noticed this when I did not receive messages for a good while until I put my SIM card into a Galaxy S8 and 20 to 30 messages popped up that were pre conversation topics from the past days before after talking to T-Mobile and digits support team they are being told to replace the device one time and Advising customer to keep the Nougat software until a fix ia found or until further notice this issue seems to be tied to the Z2 only and Oreo update just wanted to throw this out there as a pre warning the alternative solution the tech told me is that you can use a different messaging app but who's to say you'll ever know if you're not getting all your messages .
It evidently seems to be affecting incoming messages alternatively at your own choice maybe Nougat could be flashed back "Not sure" but this is a real life issue for this phone . If you want to be certain and surprised login to T-Mobile digits activate it and see what messages that you have not got
Hope this information is appreciated.
Click to expand...
Click to collapse
I have already experienced this issue. It's NOT related to wifi calling at all. I tested it with wifi calling on and with it off, same results.
What worked for me to FIX it was to clear storage and clear cache on the "native" app. You won't lose messages already on the device but you should backup with Carbonite sms first to be safe. Once I wiped storage and cache for the app I started receiving messages again normally.
I found out I was missing messages by installing digits. It's all working now but I'm keeping digits temporarily just to be safe.
texasaggie1 said:
I have already experienced this issue. It's NOT related to wifi calling at all. I tested it with wifi calling on and with it off, same results.
What worked for me to FIX it was to clear storage and clear cache on the "native" app. You won't lose messages already on the device but you should backup with Carbonite sms first to be safe. Once I wiped storage and cache for the app I started receiving messages again normally.
I found out I was missing messages by installing digits. It's all working now but I'm keeping digits temporarily just to be safe.
Click to expand...
Click to collapse
Wait so your saying this is a fix wether on Oreo or nougat and digits is the whole reason why .
And the native message app just need to clear cache and data in settings app
Sent from my [device_name] using XDA-Developers Legacy app
I deleted and deactivated digits completely. After I had it completely removed from my account, I rebooted and changed to Android Messages and everything has been fine since October.
Are the issues with this phone sorted yet? I was looking to purchase the T-Mobile variant of this phone but have read about issues such as not receiving texts (huge problem), VoLTE not working with Galaxy S7s, and WiFi connection issues. If they are not fixed, can they at least be avoided by refusing the Oreo update? I would like to avoid rooting my phone just to fix a defect and would only consider using a 3rd party messaging app if it fixed the problem without introducing other problems.
I have my phone choices currently narrow down to the Z2 Force, LG G6, and Galaxy S7 (all are currently in the $400 range). I was leaning towards the Z2 since it's the most powerful, but the issues I'm reading about seem quite severe.
After a little more research I see 2 patches were released for the Z2F after the Android 8.0 update.
https://support.t-mobile.com/docs/DOC-35970
I found a Reddit thread (https://www.reddit.com/r/Moto_Z/comments/7zxcpo/tmobile_moto_z2_force_ocx271_update/) where some people mentioned it fixed the SMS notification and Galaxy S7 VoLTE issues. I didn't see anything anything discussing the Bluetooth/WiFi issues or more importanly, the SMS not being received issue (the topic of this thread). Can anyone comment if those were fixed?
cyborgLIS said:
Are the issues with this phone sorted yet? I was looking to purchase the T-Mobile variant of this phone but have read about issues such as not receiving texts (huge problem), VoLTE not working with Galaxy S7s, and WiFi connection issues. If they are not fixed, can they at least be avoided by refusing the Oreo update? I would like to avoid rooting my phone just to fix a defect and would only consider using a 3rd party messaging app if it fixed the problem without introducing other problems.
I have my phone choices currently narrow down to the Z2 Force, LG G6, and Galaxy S7 (all are currently in the $400 range). I was leaning towards the Z2 since it's the most powerful, but the issues I'm reading about seem quite severe.
Click to expand...
Click to collapse
The latest 2 Oreo updates have fixed those problems, and they didn't affect everyone.
Sent from my Moto Z (2) using XDA Labs

Don't receive SMS messages

Hi,
I just got a Mi 9 today and everything works fine (i can receive phone calls normally..) but i noticed that there was a problem with sms messages : i only receive some messages (not all of them) and the ones that arrive are delayed.
And i don't receive apps confirmation messages at all (Xiaomi account, WhatsApp, WeChat...)
I checked the SMSC and it was correct.
I hope someone can help me with this problem.
Thanks
Amine
There are a couple settings you might want to change. If you enable Developer Options there is a Toggle called mobile data always active. Some phones (like those from Google) have this enabled by default. If it's not already enabled I click that setting on. I have never noticed additional data usage on any phone as a result of that being enabled--it just allows for faster network switching.
In WiFi settings you probably have an option to stay connected to WiFi while your phone is asleep. I always enable that as well.
You are probably getting delayed SMS and notifications because the data connection is off when your phone is sleeping--and if your phone is connected to WiFi but your carrier doesn't support WiFi texts then you won't receive texts until your data connection is reestablished.
I would like to bump this subject.
I just purchased a Mi 9 and I have the very same problem as the OP.
Following jhs39 indications didn't help.
Appreciate all the help
jhs39 said:
There are a couple settings you might want to change. If you enable Developer Options there is a Toggle called mobile data always active. Some phones (like those from Google) have this enabled by default. If it's not already enabled I click that setting on. I have never noticed additional data usage on any phone as a result of that being enabled--it just allows for faster network switching.
In WiFi settings you probably have an option to stay connected to WiFi while your phone is asleep. I always enable that as well.
You are probably getting delayed SMS and notifications because the data connection is off when your phone is sleeping--and if your phone is connected to WiFi but your carrier doesn't support WiFi texts then you won't receive texts until your data connection is reestablished.
Click to expand...
Click to collapse
SMS does not arrive through DATA connection, as far as I know. It uses plain old GPRS signal. Data is for internet.
Same for me. don't receive apps confirmation messages at all (Xiaomi account, WhatsApp, Facebook. etc
Amiiine said:
Hi,
I just got a Mi 9 today and everything works fine (i can receive phone calls normally..) but i noticed that there was a problem with sms messages : i only receive some messages (not all of them) and the ones that arrive are delayed.
And i don't receive apps confirmation messages at all (Xiaomi account, WhatsApp, WeChat...)
I checked the SMSC and it was correct.
I hope someone can help me with this problem.
Thanks
Amine
Click to expand...
Click to collapse
What about APN's?!
Did You check this?!
There must be two APN's, one for data connection (internet) and other of MMS messages only.
Amiiine said:
Hi,
I just got a Mi 9 today and everything works fine (i can receive phone calls normally..) but i noticed that there was a problem with sms messages : i only receive some messages (not all of them) and the ones that arrive are delayed.
And i don't receive apps confirmation messages at all (Xiaomi account, WhatsApp, WeChat...)
I checked the SMSC and it was correct.
I hope someone can help me with this problem.
Thanks
Amine
Click to expand...
Click to collapse
I´m having the exact same issue with the Xiaomi Mi 9 T Pro, I can receive SMS from another numbers, but I'm not able to receive sms from big companies (Xiaomi account, Whastapp, Steam) I know is the phone because I put my SIM card on my old phone, and all the company SMS where going through just fine!
Does someone knows the solution from this? I really wanted to use Xiaomi but is getting really difficult and really frustrating at the same time :/
I have a similar problem.
I don't use a Xiaomi's account, so I haven't noticed that problem.
My problem is with Google verification sms.
I don't receive them, or they come much later than they used to on my old phone.
Regards
Gudni
someone managed to solve? My cell phone was working normally and a week ago stopped receiving sms from applications and companies. Please if anyone knows help
I have the same problem since last Thursday... but in my case, it only happens when the SMS is sent from a foreign Phone number; if somebody from my country sends me a SMS it works fine (and, of course, I am able to send SMSs to my country and foreign countries without any problem).
I had the same problem... but i was connected to my VPN.. once i disconnected from the VPN.. everything worked fine
as for me i get sms but NOT MMS. i have defiantly tried a ton of apns and no MMS
Xiaomi is becoming a headache
I have realized that Xiaomi seems to be a good smartphone (mine is a Redmi Note 8 Pro), but at the end it is a very problematic one. Mine never connects to 4G LTE and my SIM card is a valid one which works fine with other phones (Samsung S8, Samsung J7 Neo, Moto G5 plus and Huawei Y7). I have done everything possible that I have read in the internet and I don't get to fix it. I'm about to give up ...

Help: Weird SMS Problem

Need help diagnosing and solving a bizarre problem: S10 doesn't receive texts from a specific sender, except after restarting, retroactively receives all texts sent by that sender. Supernatural powers might be involved, given the sender's phone is mine, and the fickle S10 is my wife's.
I'm including a lot of info below, b/c this seems to be a tough problem to diagnose, so I'm erring on the side of completeness.
Specs: My phone is an LG V35, rooted with Magisk, Android 9. Her S10 is not rooted, running Android 9. Her phone is logged in to the same Google account I use on the Play Store, so that she can use any of my paid apps without paying again. (This has never caused any SMS problems in the past, just annoyances like her getting my reminders, which I then turned off on her phone.)
The problem started on 10/26/22 (about three weeks ago). I know this b/c I sent her a long text that day, which her phone received immediately, followed by another text that same day, which she didn't receive until eight days later on 11/3/22. There were several other texts I sent btw 10/26 and 11/2 that she didn't receive until 11/3. However, we did not catch this problem until yesterday (11/17), when she discovered that I had not, in fact, been ghosting her, but that her phone was not getting my texts. We found this out b/c some other app on her phone wasn't behaving normally, so I restarted her phone -- and BAM, all my unreceived texts suddenly arrived on her phone. Since then, I've tried texting her phone, and it receives nothing from me until a restart, and then her phone receives all my texts retroactively.
As far as we can tell, neither of our phones has any problem with SMS communications with anyone else's phone (except some iPhones -- don't get me started). Other people receive my texts normally, and her phone receives other people's texts normally.
I tried texting her from two different Google Voice accounts I have (both different from the Google account our phones share), and her phone received both G-Voice texts immediately.
I tried changing my SMS app (from Pulse to Textra). No effect (her S10 didn't receive texts until restarting). I tried changing her SMS app. No effect. I did a Samsung software update (thru Settings) on her phone. No effect.
I have an old S10e, my last phone before I switched to the LG. As an experiment, I popped her phone's SIM card into my old S10e. I installed an SMS app neither of us has ever used before, Handcent Next, on the S10e. Without doing anything else (i.e. w/o transferring her S10 data or settings to the S10e), I texted her number from my LG. The text arrived immediately in Handcent. I thought, Eureka!
I promptly factory-reset my S10e, and used Samsung's Smart Switch to transfer "Everything" from her S10 to the S10e. After all her data, apps, & settings were transferred to the S10e, I texted her number, and… NOTHING. The S10e did not receive my text, until I restarted it.
So, my question to all Android sleuths out there is: What the hell?
Excellent detail and info.
My initial guess may be because you're sharing the Google account. Yes, I know you said this didn't cause problems before, but now with Google Messages (I know you're not using that, but still) doing lots of RCS and background stuff, I imagine there may be some behind-the-scenes interaction that is causing problems. I'm not saying this is a fault of RCS or anything like that, but I think the sharing may be the issue?
I would suggest trying to create a new Google account, and keeping the phones on separate accounts... it's a free and easy test, I figure... and you seem quite skilled in more difficult things, so this should be easy enough?
Also note, some apps support family sharing, so if you setup a "family" between the two accounts, you may get the purchased apps on both accounts without too much issue. My wife and I do this and it has worked pretty well for our apps. (FWIW, we both have S10+ and use GMessages on separate google accounts, family shared, and don't have any issues with texts, etc.)
schwinn8: I liked your idea & reasoning, and I implemented it -- new personal Gmail account for her, added to my G-family. Restarted her phone, and sent her a text which did not arrive. (I texted her from a Google Voice account, and that SMS arrived instantly.) I then restarted her phone again, and, for the first time, the initial text still did not arrive. That's new, at least.
What setting could possibly delay a text from coming in?
Well, that's not the direction I wanted things to go either!
Not sure what else could delay texts from coming in... not aware of any delay mechanisms in most cases.
Are both on Wifi during this process? Is the LG running a ROM with working VOWIFI? Yes, I am grasping at straws...
Well, recalling my old Windows 3.x experiences, I factory-reset the S10e (my old phone), and installed all of my wife's apps and recreated all her settings on it from scratch -- i.e. no transferring apps or settings from her phone. A labor-intensive solution, to be sure, but it is working so far. The S10e receives my texts normally.

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