Forced carrier update breaks visual voicemail - Samsung Galaxy S21 Questions

Hello, I have a verizon s21 base that is currently using a visible (Verizon nvmo) sim, and t-mobile esim. Visible visual voicemail works just fine with verizon firmware/carrier package, However if I enable the t-mobile esim it forces me to install t-mobile software, splashscreen, apps which erases the Samsung "voicemail" app.
I have tried to backup the apk and re install, installing downloaded apks, and installing from a link to galaxy store voicemail app. Installing myself the app will not launch and crashes, and when going to the galaxy store link it says my device is not supported. I believe the t-mobile software disables/breaks samsung vvm.
The only way I have found to make visual voicemail work is to disable t-mobile esim, pop a verizon sim in, let it install verizon carrier software, and re insert my visible sim. As soon as I enable my t-mobile esim I am forced to change back t-mobile software.
Is there any way to force the phone to stay on verizon software? Visible does not have their own carrier package. I was going to try to flash to U1 firmware but have read of ppl having issues using vvm on the U1 firmware with verizon, so I may have the same issue with visible.

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Tethering works just once!

I’ve figured out a way to get tethering to work once with my Lumia 920 on ATT.
The below process has to be repeated every time so it is not really a solution but may help somebody smarter figure out a solution.
Insert ATT SIM
Enable internet sharing (fails with call ATT message)
Insert Vodfone SIM ( I assume any non active sim will work, this one is from an old blackberry )
Enable internet sharing (fails)
Insert ATT SIM
Enable internet sharing (works!)
Only works once though, when you disable and re-enable it goes back to the call ATT message.
Somebody needs to jailbreak this phone so we can change whatever registry setting is causing this.
I'm able to use tethering on my ATT 920 using the access point app, I just re-added the APN settings and that's it
note: I'm using it on a non ATT network
ellokomen said:
I'm able to use tethering on my ATT 920 using the access point app, I just re-added the APN settings and that's it
note: I'm using it on a non ATT network
Click to expand...
Click to collapse
It is known this works fine on other networks if you manage to unlock the 920.
What people want to do is get tethering working on AT&T. It's basically impossible, though. It quickly loads the APN settings when there is an AT&T SIM, and that includes checking the tethering entitlement. We have no registry access so we can't change this behavior, even with the Access Point app. You could on WP7 devices if you had registry access, the same modification should work if there ever is a way to get registry access on WP8.
I tried AT&T ROM, Rogers ROM, and Euro Dev ROM. All of them checked entitlement and told me to call AT&T. I was able to get the Rogers ROM to tether once on first bootup, probably due to the same quirk that allows it to work the way the OP described. Overall it's not a very feasible solution, especially since opening the SIM slot is a pain on the 920. Tethering is one reason why my 920 has been relegated to being a secondary phone and why I use my GN2. Even though I don't really like Android, it is easily modified to allow tethering whether AT&T is happy about it or not.
Ok I understand.
Sidenote: How did you manage to install a non AT&T ROM? I always get the FFU device id mismatch when trying to put a non AT&T rom on the phone.
ellokomen said:
I'm able to use tethering on my ATT 920 using the access point app, I just re-added the APN settings and that's it
note: I'm using it on a non ATT network
Click to expand...
Click to collapse
ellokomen said:
Ok I understand.
Sidenote: How did you manage to install a non AT&T ROM? I always get the FFU device id mismatch when trying to put a non AT&T rom on the phone.
Click to expand...
Click to collapse
NCS will allow you to flash the Rogers pre-portico ROM. You can now flash Rogers and Euro ROMs, not sure about AT&T. From there you use the built in upgrade functionality to get Portico. Once you have portico NCS will let you flash Rogers Portico and Euro Portico ROMs. But I was not able to get back to pre-portico or to AT&T from there. I was flashing a 920 with a defective proximity sensor that I mailed back to AT&T the next day, so it didn't really matter.
LTE connectivity was giving issues with non-AT&T ROM. Rogers ROM took a while to connect to LTE (much longer than AT&T ROM) and the Euro ROM never really seemed to connect to LTE.

How to use sprint g3 (ls990) with straight talk gsm sim

1. Insert Straight Talk ATT sim
2. Set mobile networks to GSM/UMTS
3. Go to system updates and select update PRL
4. After its updated go back to mobile networks and switch it from global back to GSM/UMTS (it will auto switch when you update prl)
5. Go to roaming in settings and scroll to the bottom and set APN
6. Download Signal Check or Signal Check Pro from the play store to show data signal in the status bar
7. The no sim icon will still be in the status bar but you can remove ot with tweakboxand set carrier text
YOU WILL HAVE TO REPEAT THIS EVERYTIME YOU REBOOT YOUR PHONE SO ITS TEMPORARY UNTIL WE GET FULL UNLOCK
PLEASE SHARE AND GIVE THANKS
(I have only tested this with an ATT ST SIM)
I installed cloudy and used network app from the play store and picked cmda/gsm/lte everything works. I didn't even have to set the apn or mess with the dialer it is all good ?
I registered my phone with Straight Talk a couple days ago and I've been trying to get it to work. I've looked everywhere and Straight Talk has lived up to their reputation of having terrible customer service. Anyway, they've confirmed that my phone is activated, but I can't make a call or anything. I'm thinking it has to do with my settings.
Just to cover all the bases, I tried to activate on the CDMA network via the network access code, but I couldn't register my phone due to no coverage in my area (which I know is not true). So I registered on GSM with the ATT SIM card. My Sprint service no longer works, although I'm showing signal bars in the status bar. Whenever I try to make a call it says "Unable to validate your account. Please contact customer services."
I tried the steps listed in the first post but whenever I switch to GSM/UMTS and try to update the PRL it says "Authentication error. Please try again later."
It's also worth mentioning that my phone is rooted and I have frozen a lot of apps, most of which are listed here:
http://forum.xda-developers.com/sprint-lg-g3/general/sprint-g3-bloatware-list-t2873199
If anybody out there can help I'd greatly appreciate it. I'm not sure where else to turn.
You can try my guide it may allow you to fully unlock your settings so you can do what he is saying above.
Here is the thread link: http://forum.xda-developers.com/sprint-lg-g3/general/how-to-gsm-unlock-t2961099
Ok, after much research and many reboots, I've finally got it working. I tried several different methods but the one that finally worked for me was installing the CloudyG3 rom. I'm no expert by any means but my guess is because you have to completely overwrite any evidence of Sprint that is preventing the other carrier's SIM card from working (for me this was ATT through Straight Talk). I had to set my Network mode to GSM/WCDMA/LTE auto. My data is not quite as fast as I had hoped at 21.06 down 3.72 up but at this point it's better than nothing.
A couple problems I've noticed so far is after cloudy finished installing and my Lookout was running it's first test it flagged QuickApps and LGBackup as malicious apps. I didn't uninstall them yet because they seem harmless but I did freeze them with Rom Toolbox just in case. Can anybody confirm that they're safe or that uninstalling them won't cause any bugs? Also my messaging app no longer works which is a little disappointing as I really enjoyed it for a stock messaging app. Anybody know why this is?
what version of cloudy sir?
D-FUSE said:
I installed cloudy and used network app from the play store and picked cmda/gsm/lte everything works. I didn't even have to set the apn or mess with the dialer it is all good
Click to expand...
Click to collapse
what version of cloudy sir?
4g LTE on gsm
D-FUSE said:
I installed cloudy and used network app from the play store and picked cmda/gsm/lte everything works. I didn't even have to set the apn or mess with the dialer it is all good
Click to expand...
Click to collapse
Your 4G is also working in gsm sim?

Issues with Metro PCS sim

Hi. Sorry if this has already been addressed. Did my best search but didn't find anything. I was wondering if it's possible to use this phone on carrier's like Metro PCS? For some reason, I can't connect at all. It just gives me the "Not a Verizon SIM" when I put the SIM in. I tried with cricket mobile and was able to connect, so not sure why metro doesn't work at all.
I've tried apn settings. Tried to format, restart, etc. Metro wasn't able to activate it over the phone and suggested I go to the store, but upon calling the store, they told me they don't activate Verizon phones. Could this just be an issue with metro? Or has anyone gotten it to work? Thanks!
Is the phone unlocked? Mine is unlocked, I also get the message "Not a Verizon Sim", but the message doesn't affect my ability to connect using another providers sim.

A102U sim issues, no mobile network but wifi calling/mms works

Purchased a A10e sm-a102u from someone. It originally was a sprint variant. Seller said it worked on cricket. She had me and sprint 3 way call to tell me they unlocked it, and a dialer code removed sprint provisioning (splash screen?) Ended up still locked to sprint sims. I found a menu hack (changeCSC apk) via applying a theme to open carrier selection inside legal info menu. I tried switching it to XAA and XAS, which allowed it to recognize my Mint Mobile sim card. This also allowed APN editing. Now the phone works to call and mms over wifi only. No mobile network and it says emergency calls only.
The build number ends in -ATE5.
The default apns are t mobile
In download mode it says carrier- BST.
Its like its half unlocked?? What am i missing? My Mint sim works in a unlocked LGv20

Unable to connect to my mobile network

I recently purchased a refurbished phone Samsung Galaxy S21 5G. I just got it yesterday, and found that I am not able to use my mobile network. The sale said it is factory unlocked, and according to the descriptions, it should work just fine with my US Mobile SuperLTE network as well. When I switched on the phone, I see Verizon on the screen and so, I assume that it was locked to Verizon in the past.
When I tried to change the network settings, specifically the APN settings, I get the message "Access Point Name settings are not available for this user." The three dots on the top with reset to default is also greyed out along with Network mode in the previous page. When I click Network Operators and try to connect to the network manually, I am only able to connect to Verizon Wireless and no other. But, calling and messaging seems to work fine. Is it that the unlock process has not been completed properly? Did any of you face the same problem before? It would be great if there is something that I could do to unblock the APN settings as the rest of the phone works really well. The specific model is SM-G991U.
Thanks!
Aisp said:
I recently purchased a refurbished phone Samsung Galaxy S21 5G. I just got it yesterday, and found that I am not able to use my mobile network. The sale said it is factory unlocked, and according to the descriptions, it should work just fine with my US Mobile SuperLTE network as well. When I switched on the phone, I see Verizon on the screen and so, I assume that it was locked to Verizon in the past.
When I tried to change the network settings, specifically the APN settings, I get the message "Access Point Name settings are not available for this user." The three dots on the top with reset to default is also greyed out along with Network mode in the previous page. When I click Network Operators and try to connect to the network manually, I am only able to connect to Verizon Wireless and no other. But, calling and messaging seems to work fine. Is it that the unlock process has not been completed properly? Did any of you face the same problem before? It would be great if there is something that I could do to unblock the APN settings as the rest of the phone works really well. The specific model is SM-G991U.
Thanks!
Click to expand...
Click to collapse
So, you need to go into the settings menu and find about phone, software info. What you want to find is the CSC information.
It will basically look something like this: XAA / XAA-XAA / XAA (or some other letters like VZW or ATT or TMB etc etc.
What taht will tell you is very helpful in determining what rom the phone is running and what kind of device it was originally. Find that in your device and post it and people will help you to figure out what it means.
AsItLies said:
So, you need to go into the settings menu and find about phone, software info. What you want to find is the CSC information.
It will basically look something like this: XAA / XAA-XAA / XAA (or some other letters like VZW or ATT or TMB etc etc.
What taht will tell you is very helpful in determining what rom the phone is running and what kind of device it was originally. Find that in your device and post it and people will help you to figure out what it means.
Click to expand...
Click to collapse
Thank you so much for your reply. I looked through the software section in the about section. I found the following codes about the rom.
Aisp said:
Thank you so much for your reply. I looked through the software section in the about section. I found the following codes about the rom.
Click to expand...
Click to collapse
So the csc info is complicated, I'm no expert on it. But it does look like the OYN indicates it's a multi csc rom. It does have XAA as a part of the code, and that indicates it's 'open' for that specific part. But all the others are VZW. So it's running a vzw rom, obviously.
Your sim US Mobile uses both verizon and t-mobile networks. So it working for calls and texts makes sense, as a vzw phone. You could use patched Odin and flash a different (open) rom, but first you should verify that the device really is unlocked from vzw.
Best way to do that would probably be to insert another carriers sim card and see if it can make calls / texts. If not, it's not unlocked. But are you saying everything works now except mobile data? IOW, no internet access?
I had an international sim card at hand and I put it in. Interestingly the APN settings are no longer blocked. But, I do get a notification from setup wizard saying the inserted sim is not from Verizon and some services may not be available. But, messaging still seemed to work and I was also receiving 4G.
Aisp said:
I had an international sim card at hand and I put it in. Interestingly the APN settings are no longer blocked. But, I do get a notification from setup wizard saying the inserted sim is not from Verizon and some services may not be available. But, messaging still seemed to work and I was also receiving 4G.
Click to expand...
Click to collapse
Oh then yer okay. That message from verizon can be gotten rid of a couple of ways; 1) use adb commands to disable the specific packages 2) use patched Odin and flash a different rom
VZW is the only rom I think that does that, and it's very annoying. I don't remember exactly which packages have to be disabled, but search google and use xda and vzw in keywords and u should find it.
The 2nd option would be my choice. It would do away with vzw crap and with an open rom you may find volte and vowifi will work also.
cheers
Thank you so much for your reply. That sounds great! To just give it a try, I tried putting in a TMobile sim and phone restarted to install software for TMobile. After that the APN settings were unlocked and now I am also able to connect to the internet using my US Moblile sim. The only problem is the the network mode is greyed out.
This rom I think only recognizes network from major telecom providers. So, just flashing with an unlocked rom would just help to unlock all the features and also remove telecom specific crap. I will try to flash it today.
Thank you again!
I also just flashed the stock firmware which is fully unlocked. And there is no bloatware from telecom OEM's. I am now able to use the network and set the APN's, but the Network Mode is still greyed out. Is it possible to know why? I am guessing that if the phone is fully unlocked, I should be able to change the Network Mode. Is there any other info that I can give you to help understand what is happening? I do not see vowifi as well.

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