Tmobile S21 Ultra unlocked last month. CSC Shows TMB/XAA. Is this an issue? - Samsung Galaxy S21 Questions

I recently moved tmobile to usmobile CDMA/Verizon. Tmobile unlocked my phone without any issues.
I was expecting the next security update to be a fresh/vanilla samsung rom.
This didn't happen. I have read multiple things about people having issues with non-tmobile bands working on the device if the CSC is wrong. USMobile has me manually set the APNs and the phone connects to 4g/5g without issue. However the ultra wide band does not seem to want to work.
Is there an issue here? It's really hard to tell. Should I wipe the device? I really don't have the means to install a downloaded firmware at this moment. At the end of the day, I don't care that it's branded - just that it functions on the CDMA network fully. If it wont, then I will jump over to the GSM side of USMobile.

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Data Connection Partially Lost on Unlocked Sprint M9 after Official Nougat Update

Hi all, sim unlocked s-off sprint m9 used to work well on android 6 with official rom. But until the phone was upgraded to Android 7. Data connection stopped working for one operator (NOS in Portugal). However Vodafone works well.
Tried different roms and apn settings, same at all. Data connection does not work on NOS operator.
Does anyone have similar issue and of course any advices?
Thank you all.
redoano said:
Hi all, sim unlocked s-off sprint m9 used to work well on android 6 with official rom. But until the phone was upgraded to Android 7. Data connection stopped working for one operator (NOS in Portugal). However Vodafone works well.
Tried different roms and apn settings, same at all. Data connection does not work on NOS operator.
Does anyone have similar issue and of course any advices?
Thank you all.
Click to expand...
Click to collapse
Why sim unlock a Sprint variant and not an AT&T or T-Mobile which already support GSM?
did you find a solution?
i have exact same issue.
bought one m9 from ebay with sprint (651) firmware on.
lte was working fine in israel (1800 2100).
after nougat im only getting 3g.
it makes sense that i cant use those bands (1 and 3 i think) on a sprint device.. but it did work with marshmallow
Same problem in the USA
I have (nearly) the same problem in the United States with a Sprint CDMA version of the One M9. The main difference is that my data speed is even worse than 3G, around 10-20 Kbps. Occasionally, I get faster speeds, but I haven't been able to figure out if it is location-specific (but always away from home and work) or due to some other characteristic.
The phone came brand new in a retail box from an eBay seller. It worked as expected for 1.7 years. The OTA update which installed Android 7 (aka Nougat) in early 2017 resulted in the very slow data speeds. WiFi is unaffected, but data is so slow that I cannot reliably send or receive MMS; Google Maps says that I do not even have a data connection for traffic info.
EcoMobile (my MVNO provider; I still have a sprint email address, so I know who is actually providing service) could only suggest resetting my phone; did this twice with no change in operation (but several of the programs which automatically re-installed themselves operated differently, including GMail no longer providing auto-complete for addresses).
After literally 2 hours in chat with htc, they told me that my MEID indicates my phone was "made in Taiwan". I took this to mean that: 1) the person I was chatting with had poor English skills (because aren't they all made in Taiwan?), and 2) my phone is gray market (meaning it was not imported into the country via official channels, even though the manual was in the American version of English).
I came to XDA looking for an answer, too. I was mildly surprised to see that this topic was at the top of the list for the One M9.
The best solution for my situation would be the proper ROM for my phone, but I don't know how to figure that out from the MEID. htc USA says they cannot help me with this.
I could even go back to Android 6, but I do rather like the new features in Nougat.
Alternatively, I could root the phone and install a 3rd party ROM, but I still need to know how to choose the proper one for my phone.
I hope this info finds its way to a helpful expert.
Regards,
Jeff

SM-G965F on T-Mobile, what are my options?

So I learned the hard way that you can't have it all.
I travel for work quite a bit and I was in the Middle East working when my Verizon S7 Edge started to have problems. I looked for a replacement in Dubai and was happy to find the S9+ at a reasonable price and with the 256GB option (which I wasn't finding in the US). I popped in my Verizon sim and life was good.
Then I returned to the US and. nothing. worked. I had forgotten that Verizon was strictly CDMA in the US and this phone had no CDMA radio.
I also was noticing that the samsung pay app was locked to the UAE version which was annoying but not a huge issue...I couldn't add American Express credit card which may or may not have been due to that region setting.
So in order to actually get service I switched to T-Mobile and have had decent data rates. However the phone doesn't use volte or wifi calling which is very bad since where I am staying is somewhat of a dead spot for mobile coverage. I basically can't receive phone calls here and making a call requires me to wait about a minute for the phone to figure out what protocol to connect to (dowleveling to either a 3g or H to actually connect and dial).
My initial research tells me that I don't want to root the phone and lose all ability to use samsung pay, but I would love to do as much as I can to the phone to get it working as best as possible.
Can someone chime in here to let me know what's possible? I don't want to experiment too much, and it's been rare over the years for me to keep up with all the root/firmware/rom etc. that has become available. My last real era of rooting phones was many years ago with iPhone and even then it was a lot to keep up with.
thanks in advance!
bump.
Anyone?
I had the same issue. I ended up rooting to get TMobile volte/wifi-calling. Also, by rooting you can also use Verizon Wireless; however, only with LTE.
You could use Google Pay lol.
Furthermore, I suck at giving reasons, but that's what I did.
Don't quote me on this, but from what I understand, you can use the patched ODIN and flash the firmware's CSC outside of it's region and change it to XAA. There is also a guide to changing CSC without root that may work as well.
From what I understand, the G965F is unable to load the XAA csc without root since it is only for the Snapdragon version
I ended up using Tekhd's tmobile detonator after I bricked my G965F/DS atleast 3 times. It works great now.
The way to change csc without root is via a combination rom and using Realterm. Using TMB CSC on a global G965F/DS ROM will end up in a PUK code lock. I tried ALL the US CSC on my G965F to confirm this.

Carrier unlocking S9+'s gsm vs cdma.

This situation was dealing with the SM-G965U U.S. S9+
I recently had itekimei unlock two S9+'s. They were from xfinity mobile, which is CDMA.
The phone's work, but only on CDMA band carriers i.e. verizon, sprint. With GSM, only messaging and data work. Data barely.
Is it commonplace to be stuck with either GSM or CDMA frequency carriers after having professionally unlocked the network? Like if you had a locked T-mobile phone and had it unlocked, you'd be stuck on GSM correct?
Maybe this is a given and I am ignorant.
I didn't exactly check whether xfinity ran on cdma or gsm before I purchased them, so that was my fault, not itekimei. He's a great guy. Highly recommend him, as long as you have your radio systems correct.
Edit: I think I found the answer, and that is the U.S. S9+ is not cross compatible with GSM and CDMA. Please correct me if I am wrong and tell me how to make it happen if you know. Thank you.
-Bob
The phone does work with GSM providers for calling, messaging and data. Check your preferred network type and select a different one. I replied to another thread you posted in with the setting I used that works.
Before unlocking my phone I had done an extensive amount of reading and research. If I was gonna pay for the unlock I wanted to make sure it would work for GSM networks. From what I can tell the G96U phone you have would be virtually identical to the one I have, with the exception of the carrier installed firmware. This is what would define the phone as Sprint or Xfinity. So if my phone works for calling, data and messaging on AT&T which is a GSM network then yours will too.
If needs be flash the U1 firmware to the phone as this would be the one that is on the unlocked S9 you can buy from Samsung. As a firmware for unlocked phones i believe it would be the most generically compatible with the providers for this scenario... well it's one of the reasons why I flashed it on my phone. The other is since I no longer use Sprint I dont need the Sprint bloatware.
There are tutorials on how to flash the G965U1 firmware to a g965U phone on this forum.
Also try keeping your inquiry to one thread instead of making multiple ones. Keeps all insights, discussions and etc in one spot and not multiple places.
scottusa2008 said:
The phone does work with GSM providers for calling, messaging and data. Check your preferred network type and select a different one. I replied to another thread you posted in with the setting I used that works.
Before unlocking my phone I had done an extensive amount of reading and research. If I was gonna pay for the unlock I wanted to make sure it would work for GSM networks. From what I can tell the G96U phone you have would be virtually identical to the one I have, with the exception of the carrier installed firmware. This is what would define the phone as Sprint or Xfinity. So if my phone works for calling, data and messaging on AT&T which is a GSM network then yours will too.
If needs be flash the U1 firmware to the phone as this would be the one that is on the unlocked S9 you can buy from Samsung. As a firmware for unlocked phones i would think it would be the most generically compatible with the providers.
There are tutorials on how to flash the G965U1 firmware to a g965U phone on this forum.
Also try keeping your inquiry to one thread instead of making multiple ones. Keeps all insights, discussions and etc in one spot and not multiple places.
Click to expand...
Click to collapse
Sorry, I had actually came back here to delete this thread after I thought about it before I read what you wrote. I was just at work my apologies. And thank you for correcting me. I will check out how to flash the U1.

Question Sony Xperia 1 iii xq-bc62 5G not working. Flash xq-bc52?

Hi, i bought a unlocked xq-bc62 in US. I travel a lot and discovered 5G won't work in several carriers networks, no matter what I do in the phone ( I spend more time outside US). I called the carriers support and they confirmed their network doesn't have any lock preventing the use of overseas 5G bought phones. So far, I tried to use it in Portugal, UK, Ireland and Brazil but 5G is not recognized by the phone. I changed the sim for a 5G local one, changed ASN, manually chose network (5G ones are not displayed) and no success. I even tried to pray, but again, no success. I contacted Sony Support and they said phone will only work in 5G in 2 of the 3 main carriers in US and not outside US, despite the phone tech specs says it will work in all the frequencys used by above carriers. There are some threads here that confirm xq-bc62 Is not a full 5g phone. All said and done, my Question: is it possible to flash another region Image like xq-bc52 or xq-bc72 in this hardware? Will it work fine and, mainly, will 5G networks be accessible outside US? Tks
Some times its hardware but you can try mtk engineer mode settings there may be something of use there
If you can get the original vendor file usually have (user low ship...) its usually international
Unless the phone is using 4.5G and not real 5G
marcofgn2 said:
Hi, i bought a unlocked xq-bc62 in US. I travel a lot and discovered 5G won't work in several carriers networks, no matter what I do in the phone ( I spend more time outside US). I called the carriers support and they confirmed their network doesn't have any lock preventing the use of overseas 5G bought phones. So far, I tried to use it in Portugal, UK, Ireland and Brazil but 5G is not recognized by the phone. I changed the sim for a 5G local one, changed ASN, manually chose network (5G ones are not displayed) and no success. I even tried to pray, but again, no success. I contacted Sony Support and they said phone will only work in 5G in 2 of the 3 main carriers in US and not outside US, despite the phone tech specs says it will work in all the frequencys used by above carriers. There are some threads here that confirm xq-bc62 Is not a full 5g phone. All said and done, my Question: is it possible to flash another region Image like xq-bc52 or xq-bc72 in this hardware? Will it work fine and, mainly, will 5G networks be accessible outside US? Tks
Click to expand...
Click to collapse
Yep, the US models have numerous disabled features and run late on updates. I've also noticed it's crippled or disabled while roaming. I'm not sure if it's directly from disabled features or it it has been blocked by telcos because it malfunctions. (It gets kicked off cell towers in the US)
The US model has slightly different radio hardware so I would expect problems flashing the OS from another region. There are some tricks for changing the feature lists that might be a safer bet.
kevinmcmurtrie said:
Yep, the US models have numerous disabled features and run late on updates. I've also noticed it's crippled or disabled while roaming. I'm not sure if it's directly from disabled features or it it has been blocked by telcos because it malfunctions. (It gets kicked off cell towers in the US)
The US model has slightly different radio hardware so I would expect problems flashing the OS from another region. There are some tricks for changing the feature lists that might be a safer bet.
Click to expand...
Click to collapse
How would one check what is and isn't turned on network wise??
I was able to flash the XQ-BC52 ROM in my XQ-BC62 hardware. So far, working fine in 4G+, but I´m in area with no 5G coverage. Tomorrow I will go to an 5G area and check f it worked. If not, I will try the XQ-BC72. I will keep you posted.
kevinmcmurtrie said:
Yep, the US models have numerous disabled features and run late on updates. I've also noticed it's crippled or disabled while roaming. I'm not sure if it's directly from disabled features or it it has been blocked by telcos because it malfunctions. (It gets kicked off cell towers in the US)
The US model has slightly different radio hardware so I would expect problems flashing the OS from another region. There are some tricks for changing the feature lists that might be a safer bet.
Click to expand...
Click to collapse
Would you mind to message me what tricks you are talking about? Tks
marcofgn2 said:
Would you mind to message me what tricks you are talking about? Tks
Click to expand...
Click to collapse
Maybe something along the lines of Getting VoLTE and VoWiFi on unlisted carriers by flashing mbn file or 5II/1&5III VoLTE patch. [Guide to release the root] or https://band.radio/
I haven't rooted yet so I haven't tried them. I bring a T-Mobile LG Velvet 5G with me when I travel. It's a little slower but doesn't have all the telco problems.
Test done, xqbc-52 doesn't see 5G network as well. XQ-BC72 SEA is a no go, don't even recognize the SIM card in the phone.
Will try another firmwares and the tweaks kevinmcmurtrie mentioned above, but my feeling is: I paid the 5G price for the Phone and actually got a a 4G Phone. Very frustrated with Sony. Thinking seriously about going back to Samsung.
marcofgn2 said:
Test done, xqbc-52 doesn't see 5G network as well. XQ-BC72 SEA is a no go, don't even recognize the SIM card in the phone.
Will try another firmwares and the tweaks kevinmcmurtrie mentioned above, but my feeling is: I paid the 5G price for the Phone and actually got a a 4G Phone. Very frustrated with Sony. Thinking seriously about going back to Samsung.
Click to expand...
Click to collapse
But hey here's the pros, best physical camera sensors, Micro SD card Slot and headphone jack...
UPDATE!!! 5G is working!!!!! After Several Attempts, I finally got 5G. What worked for me, in Claro BR Network, was flash a Hybrid ROM. I Flashed A XQ-BC52 ROM with Modem files from XQ-BC72. So far everything working as it should. My only concern, next month I will be in Germany, may I have trouble in LTE over there with XQ-BC72 modems?
Ainz_Ooal_Gown said:
But hey here's the pros, best physical camera sensors, Micro SD card Slot and headphone jack...
Click to expand...
Click to collapse
Tks for the spirits up Ainz_Ooal_Gown. The main reason I Bougth Sony 1 iii is the 3,5 mm jack. I hate USB adapters......
Ok, major setback. it worked for 3 hours and when I turned on my second Sim card the phone 5G was gone. Turned it off, reset radio configs, but no success. Apparently turning the second sim on override the BC72 configs. Time to get serious now and root the phone, what I'm very reluctant to do.
marcofgn2 said:
UPDATE!!! 5G is working!!!!! After Several Attempts, I finally got 5G. What worked for me, in Claro BR Network, was flash a Hybrid ROM. I Flashed A XQ-BC52 ROM with Modem files from XQ-BC72. So far everything working as it should. My only concern, next month I will be in Germany, may I have trouble in LTE over there with XQ-BC72 modems?
Click to expand...
Click to collapse
How did you manage to do that? Could you please explain the process?
Settings, Network & internet, Smart connectivity and turn off. On by default. See if it works. I found where I am at it tends to look for wifi over 5G.
arjun_m4 said:
How did you manage to do that? Could you please explain the process?
Click to expand...
Click to collapse
That's what I want to more..i have the xq-bc72 on mint mobile and no5g.even my kids xiaomi 11 5g ne has 5g on mint.
I am on Mint, T-mobile towers. 5G works great, has to be in your settings. For MMS use the T-mobile APN settings.
I would like to activate 4g+ on my xq-bc52!
how to do ?
thank you.

S21 Unlocked but showing Sprint as network operator on Verizon network

I just bought a lightly used so-called "factory unlocked" S21. Everything seems to work just fine (Email, Texts, Phone calls, Internet). But it's exhibiting one weird issue I've noticed. When notifications are all clear it displays "Sprint" in the upper left corner as the network. In addition to that if I go into Settings in various areas I see "Sprint". CSC codes are showing as SPR/SPR/TMB which is Sprint and T-mobile. I'll post all the screen captures.
Just as some background info, after a Safeswitch transfer, all I did was swap out the sim from an old locked S7 Verizon phone to the newer unlocked S21. I don't think using the old SIM has anything to do with displaying Sprint since it's Verizon sim. My theory is that the vendor unlocked it but didn't flash the firmware to the generic unlocked version. It still has the Sprint firmware. Verizon is sending me a new SIM which I can try but I'm not optimistic that it's a SIM issue. I have not done a factory reset because I thought the vendor sent it already reset. I'm not optimistic this would reset the "Sprint" issue either. My question is should I keep the phone or return it? It was only $299 and works perfectly. I just get a little annoyed that they sold it as "factory unlocked" but is shows "Sprint" on the home screen and it appears all over the phones Settings menus. There was a theory that Android 10 had a bug in it that caused this but I'm not sure this is the cause.
Below is a related thread and how I found out about this forum.
Verizon phone shows "Sprint" as provider?
Hi, I have Verizon and after updating to Android 10 today (official Verizon OTA update), when I check the SIM status it will sometimes say "Sprint". It'll also sometimes say "Sprint" when I swipe down from top and look in upper right hand corner...
forum.xda-developers.com
Your phone is originally T-Mobile based on the sales code you provided. You can change it to either Verizon CSC or U1 Firmware. Meaning, you would need to flash the phone, or get access to certain tools that let you simply change the CSC. If flashed to U1, the device would restart based on the inserted SIM and load all necessary firmware for proper connection, but no bloatware.
What is your desired goal? Verizon firmware, or Samsung unlocked firmware?
Thanks for the reply. I really learned a lot buying this phone and did tons of research on it. What I ended up deciding was to just keep the firmware as Sprint/T-Mobile. It does everything so well and the only sign of Sprint is the network name at the top right notification area. It doesn't bother me anymore. I had a bit of an issue with the eBay vendor saying it was factory unlocked when it doesn't have the Samsung factory firmware on it, showing Sprint whenever I have a connection to Verizon's network. But the price was really good and the phone is so nice, battery life is great. Since the phone is all setup and working great I'm just going to leave it. I did quite a bit of customization on the phone already and I'd lose some of that if I loaded new firmware.
It seems like a symptom of the Sprint/T-Mobile firmware is the eSim is not available. That was a nice surprise. This whole purchasing an unlocked phone thing has been quite the enigma. This is why I hate switching phones and I consider myself pretty tech savvy. What a mess. Then Verizon screwed up the new sim so the phone wouldn't call or text. All so they could force me into a newer more expensive plan. Crooks. So I tried to change over to Mint Mobil using the eSim option. The eSim was likely disabled in the firmware so that was impossible. Also Verizon wouldn't let them port my number without a special pin. Which I couldn't receive because Verizon botched my sim and I couldn't get the text from Verizon with the new pin. Disaster.

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