Hi, i have been trying to find an answer to this after hours of searching i've come up short and confused.
I recently switched from tmobile to verizon, and i paid off my tmobile s9+ and had it sim unlocked. When i put my verizon sim in it, nothing really happens. either it tells me that it can't register on the network or to insert a tmobile sim card.
I have tried using reset and factory reset. I have also tried the method of holding the volume bixby and power and doing a factory reset, then putting the sim in, rebooting, etc. That doesn't work either.
I see several people trying to go from verizon to tmobile, but i haven't been able to find anyone going from tmobile to verizon, and what method i need to do to get this to work, if its possible at all. Any help would be so much appreciated!
gigatigga said:
Hi, i have been trying to find an answer to this after hours of searching i've come up short and confused.
I recently switched from tmobile to verizon, and i paid off my tmobile s9+ and had it sim unlocked. When i put my verizon sim in it, nothing really happens. either it tells me that it can't register on the network or to insert a tmobile sim card.
I have tried using reset and factory reset. I have also tried the method of holding the volume bixby and power and doing a factory reset, then putting the sim in, rebooting, etc. That doesn't work either.
I see several people trying to go from verizon to tmobile, but i haven't been able to find anyone going from tmobile to verizon, and what method i need to do to get this to work, if its possible at all. Any help would be so much appreciated!
Click to expand...
Click to collapse
Use Odin to flash U1 and then go back to U. Just leave the SIM in. Don't use HOME CSC.
CrazyApe18 said:
Use Odin to flash U1 and then go back to U. Just leave the SIM in. Don't use HOME CSC.
Click to expand...
Click to collapse
That still may not help, remember Verizon is still CDMA and the T Mobile branded phone does not have CDMA bands activated and they may not even be on the phone, I don't know. Granted band 13 should work fine, being LTE, but could the sim be looking for a CDMA radio and that is why it is not working?
uzupan said:
That still may not help, remember Verizon is still CDMA and the T Mobile branded phone does not have CDMA bands activated and they may not even be on the phone, I don't know. Granted band 13 should work fine, being LTE, but could the sim be looking for a CDMA radio and that is why it is not working?
Click to expand...
Click to collapse
The hardware is identical for all US Galaxy S9 phones. Any bands that may be missing will be resolved by flashing firmware. OP could also just stay with U1 if they want unlocked, and all bands would still be there.
CrazyApe18 said:
The hardware is identical for all US Galaxy S9 phones. Any bands that may be missing will be resolved by flashing firmware. OP could also just stay with U1 if they want unlocked, and all bands would still be there.
Click to expand...
Click to collapse
That is good to know, I sure hope it works for him.
Thank you for the replies, i will try this and post back!
Well sadly with the u1 firmware files, i get an auth error SW REV CHECK FAIL. =/
CrazyApe18 said:
The hardware is identical for all US Galaxy S9 phones. Any bands that may be missing will be resolved by flashing firmware. OP could also just stay with U1 if they want unlocked, and all bands would still be there.
Click to expand...
Click to collapse
As per Samsung chat support, I've asked if the dual sim version (international) will work with Verizon. I've also asked the rep if I can switch carriers with a locked phone. They said that essentially, all phones were manufactured with the CDMA and GSM band compatibility, it just needs to be unlocked and the US versions will work on any carrier in the US and the international version (dual sim) needs to be unlocked and it will work with any carrier in any country.
That said, it seems that you're just having an unlocking issue - which is good and bad. I hope you figure this out. Try using Odin 3.13, get the CORRECT firmware for U1 or U(VZW) to flash your phone
eyewin said:
As per Samsung chat support, I've asked if the dual sim version (international) will work with Verizon. I've also asked the rep if I can switch carriers with a locked phone. They said that essentially, all phones were manufactured with the CDMA and GSM band compatibility, it just needs to be unlocked and the US versions will work on any carrier in the US and the international version (dual sim) needs to be unlocked and it will work with any carrier in any country.
That said, it seems that you're just having an unlocking issue - which is good and bad. I hope you figure this out. Try using Odin 3.13, get the CORRECT firmware for U1 or U(VZW) to flash your phone
Click to expand...
Click to collapse
Only one small correction to what they told you: The 965F (international), will not have CDMA capabilities. That might not be a problem on some US carriers. But if you can't get VoLTE working on VZW with 965F, then you're dead in the water, since you don't have 1x CDMA calling to fall back on. It becomes a data-only device. I don't have experience with it, but I wouldn't be surprised if the VoLTE doesn't work on US carriers. For GDM/WCDMA carriers, you'd probably be just fine with 965F. Even if VoLTE doesn't work, you'd still be able to call.
Hope this helps.
eyewin said:
That said, it seems that you're just having an unlocking issue - which is good and bad. I hope you figure this out. Try using Odin 3.13, get the CORRECT firmware for U1 or U(VZW) to flash your phone
Click to expand...
Click to collapse
Thanks for your reply, any idea where to get these? I'm seeing all kinds of universal stuff and people saying carrier specific don't exist, etc etc. If you happen to know i'd be extremely grateful
gigatigga said:
Thanks for your reply, any idea where to get these? I'm seeing all kinds of universal stuff and people saying carrier specific don't exist, etc etc. If you happen to know i'd be extremely grateful
Click to expand...
Click to collapse
Step 1
Can you find out the exact model number?
For T-Mobile, it will be one of these :
SM-G965UZKATMB (Midnight Black)
SM-G965UZBATMB (Coral Blue)
SM-G965UZPATMB (Lilac Purple)
The U is the important part, as a previous poster explained that the F models do not have CDMA support (forget what that actually means, just know its necessary for verizon)
Step 2
Next, make sure that the carrier version is correct.
Example: SM-G965UZKATMB
BST Boost
VZW Verizon
ATT ATT
USC US Cellular
ACG C Spire
TMK MetroPCS
VMU Virgin Mobile
TFN Tracfone
XAS Sprint
TMB T-Mobile
XAA Unlocked US
SPR Sprint
CCT Xfinity Mobile
Essentially, you need the firmware that starts with SM-G965U and ends with VZW
Step 3
I'm not 100% sure on how to flash from carrier to carrier but there will be a list of directions. You may need to do some research there to see if it will void samsung warranty (aka 'trip knox') or anything like that, if that matters to you. I think only a modified version of Odin will be able to do this.
Download Odin v3.13.1
Extract the firmware file you just downloaded. You should get 5 files:
AP (System & Recovery)
BL (Bootloader)
CP (Modem / Radio)
CSC_OXM (OXM CSC file, will wipe your phone)
HOME_CSC_OXM (OXM CSC file, will NOT wipe your phone)
Add each file to it's respective field in Odin v3.13.1. Use CSC_OXM if you want to do a clean flash and HOME_CSC OXM if you want to keep your apps and data.
Reboot your phone in Download / Odin mode with the following button combo: POWER + VOLUME DOWN + BIXBY
Once in download mode, connect your phone to the PC, preferably using the original USB cable you got with your phone. Odin should detect your device and a blue box will show up with the COM port number.
Do NOT tick any extra boxes. The only options to be ticked are F.Reset Time and Auto-Reboot.
Click the start button, wait for Odin to say 'PASS'. Once the flash is complete, your phone will reboot.
Click to expand...
Click to collapse
Step 4
To download firmwares, google "SAMMOBILE website: /firmwares/galaxy-s9-plus/SM-G965U"
Looks like the latest verizon firmware is here: SAMMOBILE website /firmwares/galaxy-s9-plus/SM-G965U/VZW/download/G965USQS2ARF4/223287
(I'm not yet allowed to post links)
Hey thanks a bunch, I’ll give this a shot when I get home tonight. It very well may be that the rom I got wasn’t the right one. Other threads I’ve read seemed to indicate that everything was universal now and by having the SIM card in the phone while flashing, it would download the carrier specific stuff automatically. That part at least doesn’t appear to be the case since the phone wouldn’t accept it. But I’ll download some of the carrier specifics and see what happens. Thanks again!
Did you get it to work after all?
Sorry that i forgot to update! I did get it working, but it required a bit more discussion and help on a reddit discussion someone started. I noticed that someone asked this exact question and i pointed him to this thread where he was able to get it working, then helped me with which roms he used, and i got it working as well! I've been using it daily for almost a month now. Thanks so much for everyones help, i hope that if anyone else is trying to do this, between the two threads it can help. Heres the link to the reddit thread https://old.reddit.com/r/verizon/comments/909iag/tmobile_s9_on_verizon/
gigatigga said:
Sorry that i forgot to update! I did get it working, but it required a bit more discussion and help on a reddit discussion someone started. I noticed that someone asked this exact question and i pointed him to this thread where he was able to get it working, then helped me with which roms he used, and i got it working as well! I've been using it daily for almost a month now. Thanks so much for everyones help, i hope that if anyone else is trying to do this, between the two threads it can help. Heres the link to the reddit thread https://old.reddit.com/r/verizon/comments/909iag/tmobile_s9_on_verizon/
Click to expand...
Click to collapse
Awesome gigatigga - thanks for getting back. I'm on the verge of trying this. I owe some money on my S9 plus on t-mobile but before i paid it off wanted to make sure all is good.
How are the speeds? Everything working ok? Thanks again! :good::good:
Edit: I was all set to do this and during the signup - I found out that my imei wouldn't work in Verizon's system so they used one from another phone. He advised that if I wanted to pay for insurance, if I make a claim it could be an issue because the imei numbers won't match up. Seemed like a big red flag to me. So I didn't go through with it. Wonder how others are handling this?
I just switched from the ATT firmware to ARF4 on T-Mobile, but it says there is no update available, while the newest T-Mobile update is ARF7. Does anyone know how to get updates OTA?
zman441 said:
I just switched from the ATT firmware to ARF4 on T-Mobile, but it says there is no update available, while the newest T-Mobile update is ARF7. Does anyone know how to get updates OTA?
Click to expand...
Click to collapse
Right here bro. You'll need to sign up with Sam Mobile first then download it. It's slow but it'll get there in about 4 hours or so
https://www.sammobile.com/firmwares/galaxy-s9-plus/SM-G965U/TMB/download/G965USQU2ARF7/225597/
glensta said:
Right here bro. You'll need to sign up with Sam Mobile first then download it. It's slow but it'll get there in about 4 hours or so
https://www.sammobile.com/firmwares/galaxy-s9-plus/SM-G965U/TMB/download/G965USQU2ARF7/225597/
Click to expand...
Click to collapse
use updato, much faster
Invalid SIM Card
elliwigy said:
use updato, much faster
Click to expand...
Click to collapse
Can someone help me?
I cannot network unlock a T-mobile Samsung Galaxy 9 plus which has never been active on any plan. When I insert my Verizon SIM card a system notification says "Invalid SIM card. Network Locked SIM card inserted".
I want to bring this phone to Verizon where I have an active plan. I don't have a plan with Tmobile and my friend gifted me this phone. I flashed it to Samsung stock firmware and bought an unlock code from DoctorSim. The code applied successfully however the phone doesn't unlock completely and continues to prompt for the unlock code when I insert the Verizon Sim card. When I called Tmobile they said only a phone active for 40 days on their network can be unlocked using the phone app and that my friend would have to call them to unlock the phone.
jon westerman said:
Can someone help me?
I cannot network unlock a T-mobile Samsung Galaxy 9 plus which has never been active on any plan. When I insert my Verizon SIM card a system notification says "Invalid SIM card. Network Locked SIM card inserted".
I want to bring this phone to Verizon where I have an active plan. I don't have a plan with Tmobile and my friend gifted me this phone. I flashed it to Samsung stock firmware and bought an unlock code from DoctorSim. The code applied successfully however the phone doesn't unlock completely and continues to prompt for the unlock code when I insert the Verizon Sim card. When I called Tmobile they said only a phone active for 40 days on their network can be unlocked using the phone app and that my friend would have to call them to unlock the phone.
Click to expand...
Click to collapse
i dont do network unlocks.. you need to pay ur phone off and use the tmobile unlock apk
Sent from my SM-N960U using Tapatalk
Obligatory - This is my first post here, please go easy on me. If this is the wrong section please point me where I need to go.
Okay, I have been having issues getting IMS registration (for att) on my N20U (unbranded) Snapdragon. This is an issue because I don't receive most calls without VoLTE, and the service I am using is actually FirstNet. (An at&t service that provides priority cell tower access for first responders.) Who is also dropping legacy 3G and analogue calling at the end of the year.
The FN sim I was given would not change the network CSC to ATT like it should have in order to work properly.
I was able to get to the manual CSC change menu through the dialer code with a TFW-att sim card (yes, while on oneUI 3.0). I suppose the menu is locked out when other csc's are active.
This allowed me to force change to ATT's csc, then place my FN sim in the phone. The kicker? I had to toggle "do not auto update CSC based on sim data" in the menu to get this method to stick.
Things are grand, working fine, but i got curious as to what options the other csc's had to offer. So i start flipping through the list and end up landing on.....you guessed it..... XAA.
Without thinking about it, i ran it, the phone rebooted, and now im screwed. Flashed the ATT rom with Odin- no change. Factory reset? No change. I messed up BIG.
Finale / TLDR
If you didn't get what just happened there, I used a specific sim card to enable a CSC a menu that uncle sammy does not want you playing with. Proceeded to disable auto CSC changing by SIM, then walked back into a CSC that does not allow me to open said menu. Thus preventing my phone from working fully on ANY NETWORK ever again. With root impossible...
Side notes that failed: Tried fac reset/ tried firmware flash/ tried samkey (no android 11 support)/ tried force change from network side. I hope im not out of options?
****you2dude said:
Obligatory - This is my first post here, please go easy on me.
Click to expand...
Click to collapse
Please check your PM inbox ASAP. Thank you.
-Regards: Badger50
Hello,
I have a SIM unlocked S21 from Xfinity Mobile that I'm now using on Verizon Wireless. I need to change the CSC to VZW, anyone know how? I tried all the dialer codes, and also SamKEY but no luck so far.
SamKEY says "unsupported firmware, please downgrade your firmware".
Since January 2021, it's not easy to change CSC, some people do it by flashing firmwares then block whatever app checks SIM & CSC compatibility.
You can check this thread if you're into action.
Thanks, I tried that but somehow it ignores that the VZW SIM card is VZW, and it keeps the CSC as CCT/CCT/CCT.
Even putting in an AT&T sim card, it still keeps it as CCT/CCT/CCT. The carrier name is stuck as "Xfinity Mobile" also, no matter the SIM.
I wish Samsung would implement the "BYOD" thing already for this phone.. Or maybe SamKEY will work eventually...
What's interesting is that it changes the APN to the correct one automatically for the 3 SIM cards I've tried (VZW, CCT, ATT)
Firmware bug I guess, or Samsung has not yet fully implemented the "BYOD" feature referenced here:
Move your Galaxy phone to a different service carrier
If you unlock your phone to use with another carrier, it's easy to take advantage of all your new carrier's features without losing any of your data.
www.samsung.com
UPDATE: SamKEY worked!!
I was able to change the CSC to the correct carrier!
quadrun1 said:
UPDATE: SamKEY worked!!
I was able to change the CSC to the correct carrier!
Click to expand...
Click to collapse
how many credits do I need to change CSC?
On the samkey page it says that you need 8 credits
No, if I remember correctly it's only 1 credit to change the CSC.
See here:
https://www.reddit.com/r/GalaxyS21/comments/lm0at9
Hello,
I have an unlocked Xfinity Mobile device that I bought from Xfinity Mobile. This means that I purchased from them and then paid off the phone in full, allowing it to be unlocked. I can plug in other SIM cards (such as atnt) and have them work fine, which means that my phone is 100% unlocked. However, because Xfinity Mobile is a b*tch, APN settings are still locked for some reason, even when my phone is unlocked. I believe it has to do with the fact that carrier-specific software was installed when I first installed my Xfinity Mobile SIM card. I need to access APN settings to ensure my phone gets full functionality from my new carrier, Visible, which doesn't install any carrier-specific software because it's very new or something like that. Plus, Xfinity Mobile's carrier software doesn't allow me to manually disable 5G functionality (select what bands or whatever I want to use), which I may want to do at some point. I also think the Xfinity Mobile boot load screen is hideous, and I would like to get rid of it.
After searching around, I found out that the best way to do this was to flash U1 software to my phone using Odin with the carrier code XAA or something like that to revert my phone to the original Samsung-bought factory-unlocked state. However, after searching around some more, I found out that to do this, I would have to factory reset my phone and then re-import my apps, data, images, etc., with Smart Switch, which doesn't preserve per-app data. I have way too many apps requiring logins to dig out the passwords for each app and log in again, so I would prefer not to factory reset my phone.
Searching around some more, I found out that it was possible to retain data when switching from U to U1 by selecting the "Home CSC" file instead of the non-"Home CSC" file when flashing with Odin in the respective area where it asks for the CSC file, but this would result in a "Dirty flash" which could brick my phone. Of course, I don't want to brick my phone, so this is kind of a no-go. But, some people did say that using the "Home CSC" wouldn't affect the phone that much, and it was safe to do, but I don't want to put the safety of my shiny phone on the line.
Tl;dr: I want to go from my carrier-locked U firmware to U1 unlocked XAA without losing my data / requiring a restore with Smart Switch. Is this possible?
Both the u and u1 lost the ability to switch lte bands in the June and July updates. The last one that allows changing lte bands is the may update (cvdb etc)
How To LOCK LTE Band Without Root on SAMSUNG Device
This method is specifically for Samsung Galaxy. Because the default hiddennetwork system application is available. for devices with other brands and types, I haven't tried it. Please follow the following methods: 1. You need to install this app...
forum.xda-developers.com
robnitro said:
Both the u and u1 lost the ability to switch lte bands in the June and July updates. The last one that allows changing lte bands is the may update (cvdb etc)
How To LOCK LTE Band Without Root on SAMSUNG Device
This method is specifically for Samsung Galaxy. Because the default hiddennetwork system application is available. for devices with other brands and types, I haven't tried it. Please follow the following methods: 1. You need to install this app...
forum.xda-developers.com
Click to expand...
Click to collapse
Well, I still want to flash U1. Would flashing U1 Home_CSC bootloop my phone
garailcat said:
Well, I still want to flash U1. Would flashing U1 Home_CSC bootloop my phone
Click to expand...
Click to collapse
So then the phone is NOT giving you the popup prompt to reboot to apply new carrier settings, when you insert a different SIM? And it still shows all of the Xfinity bloat and their configuration?
iBowToAndroid said:
So then the phone is NOT giving you the popup prompt to reboot to apply new carrier settings, when you insert a different SIM? And it still shows all of the Xfinity bloat and their configuration?
Click to expand...
Click to collapse
No, if I put in an ATNT SIM, it will switch to ATNT software and install its respective bloat.
However, my current service provider, Visible, does not have its carrier software/firmware. Therefore it would make no sense for me to use Visible on Xfinity Mobile carrier software.
garailcat said:
No, if I put in an ATNT SIM, it will switch to ATNT software and install its respective bloat.
Click to expand...
Click to collapse
So then can you leave it on AT&T bloat, since that firmware allows APN change/add...?
iBowToAndroid said:
So then can you leave it on AT&T bloat, since that firmware allows APN change/add...?
Click to expand...
Click to collapse
No.
I'd rather blow my brains out than have 300 useless apps. Also, the actual data indicator icon thing looks ugly as all hell.
Xfinity mobile is more stock than the other bigger providers regarding bloat and other things; it's just that it doesn't allow APN editing, which is incredibly annoying.