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US Cellular Note 9 no longer updating on AT&T?

Back in July I got a steal on a new US Cellular Galaxy Note 9, so I immediately threw my iPhone 6S SIM card into it and went through several rounds of software updates. After the last update the splash screen switched to AT&T and it suddenly had several AT&T apps. It didn't TOTALLY eliminate the US Cellular stuff because I had to delete at least one app and change the Samsung browser's default home page.
Due to the iPhone SIM card and some stuff on AT&T's side, it would not do VoLTE or WiFi calling until I got a new SIM and had AT&T use the IMEI from an AT&T Galaxy Note 9 (read it off one from the store). I did that in late August and the only remaining issue O noticed was that my MMS messages will not download as long as I am on WiFi.
I just noticed what may be a new issue: I think I stopped getting carrier updates. Looking on AT&T's site, I see that they have multiple newer updates with the latest from September 18th:
https://www.att.com/devicehowto/tut...tep_KM1278532?make=Samsung&model=SamsungN960U
My "Security Patch Level" says May 1, 2019, while AT&T's website says that there have been 4 updates since then (latest at Security Patch Level September 1, 2019).
My baseband version doesn't quite match any of the ones associated with AT&T updates, though their May 22nd update seems to be the most similar (AT&T's N960USQS1CSE1 compared with my N960USQU1CSE3).
I recall that the new phone updated multiple times and was still on Oreo before it updated again to Pie, and again to AT&T-flavored Pie. I figure the final update was really just adding the AT&T apps and splash screen, but it somehow stopped me from getting further updates from US Cellular. I'm pretty sure I had an AT&T SIM card inserted for all of my updates.
On that note, I believe I tossed the original SIM and US Cellular does not operate in my region (only showed up here through a salvage store). I'm not easily able to get another US Cellular SIM for triggering it to revert to a US Cellular ROM. I'm not interested in custom ROMs and all that and ultimately just want to keep my phone up to date the same way a normal AT&T customer would after buying theirs from AT&T. I thought the Note 9 adding carrier customizations to match the inserted SIM would take care of all this automatically (half the point, right?) but I guess I was wrong.
Is it possible to get carrier updates like I was getting before? If not, what would you guys recommend for getting up to date and staying up to date? Thanks!

CZroe said:
Back in July I got a steal on a new US Cellular Galaxy Note 9, so I immediately threw my iPhone 6S SIM card into it and went through several rounds of software updates. After the last update the splash screen switched to AT&T and it suddenly had several AT&T apps. It didn't TOTALLY eliminate the US Cellular stuff because I had to delete at least one app and change the Samsung browser's default home page.
Due to the iPhone SIM card and some stuff on AT&T's side, it would not do VoLTE or WiFi calling until I got a new SIM and had AT&T use the IMEI from an AT&T Galaxy Note 9 (read it off one from the store). I did that in late August and the only remaining issue O noticed was that my MMS messages will not download as long as I am on WiFi.
I just noticed what may be a new issue: I think I stopped getting carrier updates. Looking on AT&T's site, I see that they have multiple newer updates with the latest from September 18th:
https://www.att.com/devicehowto/tut...tep_KM1278532?make=Samsung&model=SamsungN960U
My "Security Patch Level" says May 1, 2019, while AT&T's website says that there have been 4 updates since then (latest at Security Patch Level September 1, 2019).
My baseband version doesn't quite match any of the ones associated with AT&T updates, though their May 22nd update seems to be the most similar (AT&T's N960USQS1CSE1 compared with my N960USQU1CSE3).
I recall that the new phone updated multiple times and was still on Oreo before it updated again to Pie, and again to AT&T-flavored Pie. I figure the final update was really just adding the AT&T apps and splash screen, but it somehow stopped me from getting further updates from US Cellular. I'm pretty sure I had an AT&T SIM card inserted for all of my updates.
On that note, I believe I tossed the original SIM and US Cellular does not operate in my region (only showed up here through a salvage store). I'm not easily able to get another US Cellular SIM for triggering it to revert to a US Cellular ROM. I'm not interested in custom ROMs and all that and ultimately just want to keep my phone up to date the same way a normal AT&T customer would after buying theirs from AT&T. I thought the Note 9 adding carrier customizations to match the inserted SIM would take care of all this automatically (half the point, right?) but I guess I was wrong.
Is it possible to get carrier updates like I was getting before? If not, what would you guys recommend for getting up to date and staying up to date? Thanks!
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Click to collapse
Attached is the link for my last update , I'm using it on AT&T , phone is original from AT&T, and all is Ok for me, I hope can help you.
https://www.google.com/amp/s/forum....note-9-att-rom-update-sept-2019-t3979303/amp/

Thunderxxx said:
Attached is the link for my last update , I'm using it on AT&T , phone is original from AT&T, and all is Ok for me, I hope can help you.
https://www.google.com/amp/s/forum....note-9-att-rom-update-sept-2019-t3979303/amp/
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Click to collapse
I'll check it out when I get back to my PC. Thanks! I assume it's something I need to flash with Odin?

Used to have 'free hotspot.' Is that because my bootloader was unlocked?

Hi guys. My goal is to be able to use my AT&T phone/service as a 'hotspot' again, which I have been able to do with my Note 8, but can't get it to work on my Note 9 now. I'm familiar with the technical stuff (thanks to you guys over the years), but need to have an idea of what will solve my problem. Facts first, then what I think might be the issue...
I've been using a Note 8, which I bought overseas, here in the States with my AT&T account which does NOT have the hotspot feature included. It just works though. I put in my SIM and it all boots up fine (with no ATT branding during boot) and my Note 8 has a hotspot feature, which I turn on and it works just like it's supposed to. No issues at all.
Now, I have an unlocked T-Mobile Note 9 that I want to use instead of the Note 8 I bought overseas. When I put ANY US carrier SIM in it, it forces a reboot, and when it boots up it shows whichever carrier's SIM I put in it. If I put a Verizon SIM in it, it reboots and starts showing the Verizon logo during boot, and the same with ATT, etc.
I don't mind that, HOWEVER, now when I try to use the hotspot feature, I get a warning saying something like 'your plan doesn't have the hotspot feature. Please go to to our website to choose a plan that does' and the hotspot feature is blocked completely.
Is it blocked on this unlocked T-Mobile Note 9 because it installs any SIM's bootloader each time or something? I am assuming that allows/forces the carriers to install all their own stuff each time I put a new SIM card in it, which would allow them to also block the hotspot feature on my ATT account, since it's not included in my plan.
If this is the case, is there a way to 'fix' this? I know it's unlocked because it works with other carriers, but I'm thinking maybe the bootloader is locked or something, and if I'm able to unlock it I could put a new OEM flash on it, and maybe it would work just like my unlocked Note 8 that I bought overseas which allows the hotspot feature.
Please advise, if you have any ideas for me. (Unlocked T-Mobile Note 9 SM-N960U)

I would hazzard a guess AT&T is blocking you. I have mobile hotspot in my plan and it works fine on my note9.

You need to flash the u1 firmware for hotspot to work.

Thanks for the help. I'll update this later if it still doesn't work after flashing.

sethsmaxx said:
You need to flash the u1 firmware for hotspot to work.
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^^^^ this, all day, er'ry day ^^^^
DanDroidian said:
Thanks for the help. I'll update this later if it still doesn't work after flashing.
Click to expand...
Click to collapse
youll need the patched version of Odin to flash cross carrier firmware. Not a biggie, just know that regular Odin will fail. Not might, will.

Samsung Galaxy S10 - Unlocked Phone (AT&T Blocked Call Issue)

So many people are reporting with the 3/1 sweep by AT&T, that they are blocking almost all Unlocked phones: See: Downdector Link We personally have a S10 (G973U1). AT&T is saying on this list: AT&T approved phone list that it is supposed to work. But like many other people "calls" end immediately, but we can text and data work. It is some sorta ploy by AT&T to force us to upgrade our phones. They want us all to upgrade to S22s. Anyway I was ranting. Anyway, if you look at that link, they are saying that the phone has to be on the latest software. The last update from AT&T or the manufacturer was in January. I checked the firmware site, and Android 11 is the latest in January. I'm wondering if there is some hack to get us on to '12' or something. An update might solve this issue. We know that a new SIM does not work. Calls seem to be rejected on the network, just based on the phone model or Android version.
We are aware that a version 12 is out there for the phone, just that firmware is not for our US-unlocked model yet. But maybe it can be hacked?
Edit: It appears this thread may be linked with this older one... But it is ever more pressing issue now:
S10 Unlocked phone with AT&T Firmware here they explain how, and the problems with flashing. This was back in 2019, so I'm not sure if this will still work. Even then it didn't work for everyone. Some in that forum claimed that it did. AT&T seems to now be blocking from their calling network any phones not enabled with VOLTE and the extended AT&T services that are not present in Unlocked phones.

robertkjr3d said:
So many people are reporting with the 3/1 sweep by AT&T, that they are blocking almost all Unlocked phones: See: Downdector Link We personally have a S10 (G973U1). AT&T is saying on this list: AT&T approved phone list that it is supposed to work. But like many other people "calls" end immediately, but we can text and data work. It is some sorta ploy by AT&T to force us to upgrade our phones. They want us all to upgrade to S22s. Anyway I was ranting. Anyway, if you look at that link, they are saying that the phone has to be on the latest software. The last update from AT&T or the manufacturer was in January. I checked the firmware site, and Android 11 is the latest in January. I'm wondering if there is some hack to get us on to '12' or something. An update might solve this issue. We know that a new SIM does not work. Calls seem to be rejected on the network, just based on the phone model or Android version.
We are aware that a version 12 is out there for the phone, just that firmware is not for our US-unlocked model yet. But maybe it can be hacked?
Edit: It appears this thread may be linked with this older one... But it is ever more pressing issue now:
S10 Unlocked phone with AT&T Firmware here they explain how, and the problems with flashing. This was back in 2019, so I'm not sure if this will still work. Even then it didn't work for everyone. Some in that forum claimed that it did. AT&T seems to now be blocking from their calling network any phones not enabled with VOLTE and the extended AT&T services that are not present in Unlocked phones.
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I was helped by a user to achieve ascendance onto the AT&T network. I'm not sure if I'm to reveal his name. We 1) go into Developers mode on the phone. 2) Hack the Kernel. 3) Flash the rom to the G973U (model)... with the AT&T firmware. So that the Wifi-Calling and 5G features would work, and AT&T would allow it on their network.

robertkjr3d said:
I was helped by a user to achieve ascendance onto the AT&T network. I'm not sure if I'm to reveal his name. We 1) go into Developers mode on the phone. 2) Hack the Kernel. 3) Flash the rom to the G973U (model)... with the AT&T firmware. So that the Wifi-Calling and 5G features would work, and AT&T would allow it on their network.
Click to expand...
Click to collapse
I've literally been searching for an answer to this for days now. My wife and I have S10's. I work far from home so I really need her phone working in case of emergency. Can you please point me in the general direction? Thanks!

Agreed, I didn't know such a thing was possible, but I'd love to hear more about this!

skrapmetal said:
I've literally been searching for an answer to this for days now. My wife and I have S10's. I work far from home so I really need her phone working in case of emergency. Can you please point me in the general direction? Thanks!
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Click to collapse
At first I had to use the Samsung Band Selector app from the Play store and go into More Network Settings > AT&T > Preferred Network Type and choose 3G. Unfortunately this killed LTE so all data and calls were going through H+. As I was mostly on wifi I could live with it since I could actually use the phone again.
Then Friday morning I checked for updates and there was the update to take me to Android 12. I took the update then when it finished it said it needed to reboot to connect new SIM to carrier services....it wasn't a new SIM. I let it reboot and everything was working with VoLTE again.
Hope this helps.

KennyG123 said:
At first I had to use the Samsung Band Selector app from the Play store and go into More Network Settings > AT&T > Preferred Network Type and choose 3G. Unfortunately this killed LTE so all data and calls were going through H+. As I was mostly on wifi I could live with it since I could actually use the phone again.
Then Friday morning I checked for updates and there was the update to take me to Android 12. I took the update then when it finished it said it needed to reboot to connect new SIM to carrier services....it wasn't a new SIM. I let it reboot and everything was working with VoLTE again.
Hope this helps.
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Click to collapse
I appreciate you getting back to me. Unfortunately I am still on android 11 with a custom ROM and also this is a global phone so that app didnt work for me. I dont receive OTA updatez. I'll update to a new ROM and see what happens. Thanks

SM-G973U VoLTE

I recently bought an unlocked Galaxy S10 SM-G973U on Amazon. Got new SIM card from a Verizon MVNO and activated phone. The phone downloaded Android 12, One UI version 4.0. Firmware Build number SP1A210812.016.G973USQS6HVA1. Service provide Software version SAOMC_SM-G973U_OYN_SPR_12_0007 SPR/XAA/VZW. The problem is there is no menu option to activate/switch on VoLTE which means when I'm on a call there is no internet. I've talked to the MVNO tech support multiple times and was told they couldn't see any problems on their side, or that the SM-G973U does not support VoLTE which is not true. I found on one of AT&T's sites that the SM-G973U needs a software patch to enable VoLTE. I also found a couple of USSD codes but they either didn't work or didn't get me to the right setup screen to turn on VoLTE. I even stopped by a Samsung store and they weren't any help either. They said they could re-flash a stock firmware but it would revert to being locked to a carrier which is apparently also not true based on what I've read on this forum. Anyone know how I can turn on VoLTE or know of an apk file or software patch to enable VoLTE?? Does one of the firmware versions posted online have the patch to turn on VoLTE??

I think the issue is that your phone is showing SPR/XAA/VZW. You say you're on a verizon MVNO (who, by the way?)... but your phone isn't seeing that. It's actually saying it's active for SPRint. The second one, XAA, means it's not able to detect the SIM type... and the third was that it was originally VZW, which you can't change and isn't really relevant. (That's just what the phone was "born" as).
Bottom line, your phone isn't seeing VZW or an MVNO as the active CSC nor the SIM card. In the past, the easy thing was to change the CSC to what you need, but I haven't found a way to do that actively. What's supposed to happen is that the CSC should update based on the SIM card and cell signal you're getting... but this doesn't always happen. I bought two phones - one switched with no issues, the other I could not get it to change no matter what I tried.
That said, the easiest thing is to clean flash the phone with ODIN to a VZW or your MVNO's ROM, so that (hopefully) the CSC updates automatically. You could also consider flashing a U1 (unlocked) ROM, as yours is not technically an unlocked ROM (U means it's a carrier ROM... which may be why it's not switching over?)
Again, I tried all of these on the second phone I bought, and nothing would switch it (my carrier is Total Wireless, which is a VZ MVNO, and actually shows up as Tracfone (TFN). I had to return that second phone and get another with TFN already activated, and that worked fine... so be sure you do this before you drop out of your return period.
Bottom line, you should be able to get this all working... my VOLTE/VOWIFI works fine... just a matter of getting you there.

Thanks. My carrier is Straight Talk which is now VZ. The SIM card they sent me has the wording "Verizon Compatible" written on it. I finally found a document that explains how to interpret the CSC codes and your explanation clarifies my understanding of it. Sound like I'll have to re-flash it. Since it was originally a VZW phone I'm thinking I should flash it back to VZW to see if that works before trying U1.

Dumb question as this is my first time flashing a phone. (I've flashed quite a few other things but never had to worry about CSC codes and bootloader versions, etc.) I don't see VZW firmware on samfirms or sammobile. I see Sprint, T-Mobile, and one listed as USA without carrier info but I don't see one for VZW. Can someone point me to the correct location to download SM-g973U and U1 firmware for VZW? Greatly appreciated and thanks for putting up with my lack of knowledge!
Edited: Found the files on sammobile. Will try the U1 (VZW) first. I'll keep my fingers crossed.

schwinn8 said:
I think the issue is that your phone is showing SPR/XAA/VZW. You say you're on a verizon MVNO (who, by the way?)... but your phone isn't seeing that. It's actually saying it's active for SPRint. The second one, XAA, means it's not able to detect the SIM type... and the third was that it was originally VZW, which you can't change and isn't really relevant. (That's just what the phone was "born" as).
Bottom line, your phone isn't seeing VZW or an MVNO as the active CSC nor the SIM card. In the past, the easy thing was to change the CSC to what you need, but I haven't found a way to do that actively. What's supposed to happen is that the CSC should update based on the SIM card and cell signal you're getting... but this doesn't always happen. I bought two phones - one switched with no issues, the other I could not get it to change no matter what I tried.
That said, the easiest thing is to clean flash the phone with ODIN to a VZW or your MVNO's ROM, so that (hopefully) the CSC updates automatically. You could also consider flashing a U1 (unlocked) ROM, as yours is not technically an unlocked ROM (U means it's a carrier ROM... which may be why it's not switching over?)
Again, I tried all of these on the second phone I bought, and nothing would switch it (my carrier is Total Wireless, which is a VZ MVNO, and actually shows up as Tracfone (TFN). I had to return that second phone and get another with TFN already activated, and that worked fine... so be sure you do this before you drop out of your return period.
Bottom line, you should be able to get this all working... my VOLTE/VOWIFI works fine... just a matter of getting you there.
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Success! Was able to flash U1. VoLTE is now working. The CSC now shows TFN/TFN/VZW. Much appreciated!!!

Awesome, glad to hear that fixed it easily!
And TFN... I'm a fan there, too!

Hi! I'm having a similar issue with the same model and happy to see someone was able to enable VoLTE. However, most of what you said above is a foreign language to me. Would one of you be willing to give me a crash course in what you did?
Here's my specific situation. Last week (~1/4/23) Tracfone shutdown 3G. My Samsung Galaxy S10 (SM-G973U) says my network is set to LTE/3G/2G. I've read LTE is 4G, but still can't make or receive calls/texts, but data and 911 calls still work. Their tech support is no help.
From reading online it sounds like I may need VoLTE, not just LTE. Hence finding this thread. If one of you would be willing to spare some time to walk me through what you did I'd really appreciate it. In the mean time I'll try to figure out what "flashing" mean in a context that doesn't involve showing body parts
Thank you in advance!!

I'm on Tracfone (they were bought out by Verizon, BTW) - I was on Total Wireless before, which is now Total by Verizon. You might try contacting support again, as they are now VZ, and may have more help to offer.
My S10+ is running 975U1 now, and it works for VOLTE/VOWIFI properly. You may consider getting a U1 ROM installed, and maybe even the VZW (or TFN) version if available - that may get you working.
Did VOLTE ever work for you before on this or any other carrier? What is your CSC right now?

schwinn8 said:
I'm on Tracfone (they were bought out by Verizon, BTW) - I was on Total Wireless before, which is now Total by Verizon. You might try contacting support again, as they are now VZ, and may have more help to offer.
My S10+ is running 975U1 now, and it works for VOLTE/VOWIFI properly. You may consider getting a U1 ROM installed, and maybe even the VZW (or TFN) version if available - that may get you working.
Did VOLTE ever work for you before on this or any other carrier? What is your CSC right now?
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Thanks for replying! I'm not entirely sure if VoLTE has worked previously. I bought this phone 6/2021 and have only haver had tracfone service for it. I did find in my setting that VoLTE calling is set to on so it seems like it should work. Of note, the 4Glte in my status bar has always been grayed out (I went back and looked at some old screenshots).
My current CSC is VZW/XAA/ATT.
I spoke with tracfone customer service yesterday and they had me reset my network setting and now I don't even have data and the 4Glte in my status bar that was previously gray has now completely disappeared.
Their customer service refuses to talk to me now (literally no one answers when it transfers to an agent) or they hang up on me, and no I haven't been rude, but I have told them I'm recording the call.
I bought a mint mobile package last night because I'm beyond frustrated with Tracfone. I'm worried I'll have the same problems with Mint. I'm not sure if my settings are screwed up or if it's just Tracfone. In any case things are worse now after talking to customer service yesterday.
I also notice there was no APN setting on my phone so I updated it today and restarted but no difference.
Thanks for any input!! Much appreciated. Sorry for the novel.

Ok, so based on your CSC, the phone is not seeing the SIM's carrier - it's showing XAA which means it's using the default settings, which is probably why your not getting VOLTE. The active CSC of "VZW" may be ok... depends on which carrier you're on with Tracfone. I think they're VZW only, but I'm not completely sure.
You may want to just get a new SIM card and get that activated. HOWEVER, the problem you'll likely face is that the phone was born ATT (last CSC). This means the IMEI won't match a "compatible" phone to Verizon, and they will flat out refuse to activate it (even though WE al know it will work fine). If you still want to do that, you will have to activate the new SIM on a VZ "compatible" phone, then you can swap it to the S10. Note that VZ complains about this when you talk to them... so don't tell them you're doing this... but I've done it many times and it works fine.
If your actual behind-the-scenes carrier is ATT, then you can do the activation with your phone without issue.
If none of this works for you, you can switch carriers to an ATT MVNO and you should be good to go.

schwinn8 said:
Ok, so based on your CSC, the phone is not seeing the SIM's carrier - it's showing XAA which means it's using the default settings, which is probably why your not getting VOLTE. The active CSC of "VZW" may be ok... depends on which carrier you're on with Tracfone. I think they're VZW only, but I'm not completely sure.
You may want to just get a new SIM card and get that activated. HOWEVER, the problem you'll likely face is that the phone was born ATT (last CSC). This means the IMEI won't match a "compatible" phone to Verizon, and they will flat out refuse to activate it (even though WE al know it will work fine). If you still want to do that, you will have to activate the new SIM on a VZ "compatible" phone, then you can swap it to the S10. Note that VZ complains about this when you talk to them... so don't tell them you're doing this... but I've done it many times and it works fine.
If your actual behind-the-scenes carrier is ATT, then you can do the activation with your phone without issue.
If none of this works for you, you can switch carriers to an ATT MVNO and you should be good to go.
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OK some of that was still over my head. I'll see what happens with the Mint Sim... one f/u question now though. You said the ATT means my phone was "born" ATT. I bought my phone off backmarket and it was sold as "unlocked". Was that not true? How can I be sure in the future if I buy a used phone that's not from my carrier that it will actually be compatible?

Unlocked just means it's not locked to a carrier. That is true in your case, otherwise you wouldn't have been able to install ANY non-ATT SIM. So, you did the right thing to get an unlocked phone, and that is what you got.
The issue with compatibility is just the asshole carriers spreading lies. They do this to try to get people to buy THEIR phones, for no reason other than to make money and confuse consumers. The "born" CSC has no bearing on anything, really... neither does the carrier-specified IMEI. In your case, the XAA is good, which means it's a multi-carrier ROM, which works with all USA carriers.
Mint is a good idea - being an ATT carrier (IIRC), that should work and they should help you get it up and running even if they have to activate it. Good luck!

Awesome! Fingers crossed!! Thank you for your time and all the info❣
I'll try to remember to give an update in a few weeks for future readers

Goldie8709 said:
Awesome! Fingers crossed!! Thank you for your time and all the info❣
I'll try to remember to give an update in a few weeks for future readers
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UPDATE: Switching to Mint worked like a charm! Once my number ported and I put the new SIM card in, service was instantaneous! I've had Mint for 3 weeks now and the service is so much better than with Tracfone! My calls go through nearly as soon as I hit call, the internet is faster.
I didn't need to do a thing either. No making APN settings, etc. I'm betting it has to do with what you said about my phone being born ATT. So funny because the software(?) is Verizon - shows the Verizon when I restart/power up. I still love my bastard phone
So thankful I didn't buy a different phone!!! Again thanks for all your help @schwinn8

Thanks for reporting back and letting us all know, and I'm glad it worked out well!
Yeah, the carriers pull this nonsense all the time... it's BS. The phones are all the same, only the ROM changes. If we can change ROMs (which we can) then there should be no reason to force users to specific IMEIs. But we know why they do this - follow the money. I encourage people to write to the FTC and FCC about this (I have).

Question Samsung Galaxy S21 Ultra won't work on Visible or Verizon

Hello, I'm having an issue getting my Visible service working on my Galaxy S21 Ultra SM-G998U1.
I purchased the phone on Swappa to replace my OP7 Pro, so I'm not sure exactly what carrier or model its from. But it should be factory unlocked and I can't call, text, or get data.
I tried installing a Verizon sim but still no service. T-Mobile sim works perfectly though. And I've tried all the troubleshooting steps like network reset, adding APNs, even factory reset.
When I boot the phone or cycle airplane mode, occasionally 5G will turn on for a few seconds and immediately disconnect again.
The APNs all install automatically when I put the SIM in but i just don't get any service, even though it's showing full bars.

go to your sim settings and deactivate it then reactivate it. What version of android are you running? is it rooted? Need more info on your phone. You're sure it's U1 and not an exynos model?

ffuser1 said:
go to your sim settings and deactivate it then reactivate it. What version of android are you running? is it rooted? Need more info on your phone. You're sure it's U1 and not an exynos model?
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Click to collapse
I have done that many times. I've also tried all different firmwares and SIMs from various carriers. Visible and Verizon are the only ones that don't work.
It's running Android 12 latest firmware. I believe it was originally purchased from Verizon but it's now on U1.

What does it say under service provider software version under software information? Vzw/vzw, vzw/vzw?

ffuser1 said:
What does it say under service provider software version under software information? Vzw/vzw, vzw/vzw?
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Click to collapse
Yes, four VZW codes.
It's strange because when I reboot the phone it will briefly connect to 5G then immediately disconnect and say "Emergency Calls Only". My SIM is activated and works perfectly in my OP7 Pro.
I can also use T-Mobile and ATT Sims in the Samsung.

Ok, so if I lock it to 5G or LTE then the data works. But calls and texts don't work no matter what.

So I figured it out. It seems to have been a hardware issue with the phone itself. I ordered a different S21 Ultra just to see if it would work and it accepted my SIM immediately. For whatever reason it wouldn't accept Visible or Verizon SIMs even though it was unlocked.
Bit frustrating I wasted several days trying to figure out the problem but at least I figured it out. Posting this here in case anyone has a similar issue with a second hand used S21 Ultra.

I had a s8 plus that wouldn't connect to visible and I went through all kinds of heck. I finally figured out that because the firmware was u1 that it was not compatible. When I flashed to a u firmware I was able to connect to visible. I also heard the nines and tens had the same issue. It may be that Verizon puts a block on u1 firmwares

Also I think I had to manually change a few settings for my APN after I change to a firmware ending in u.

Limon_Lime said:
So I figured it out. It seems to have been a hardware issue with the phone itself. I ordered a different S21 Ultra just to see if it would work and it accepted my SIM immediately. For whatever reason it wouldn't accept Visible or Verizon SIMs even though it was unlocked.
Bit frustrating I wasted several days trying to figure out the problem but at least I figured it out. Posting this here in case anyone has a similar issue with a second hand used S21 Ultra.
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It's funny how Visible will not accept The s21 Ultra when I have net10 5G on Verizon towers. Been that way since I bought the phone new last year.