Hey guys - so my brother-in-law gave me an 'unlocked' i717 that was running the stock AT&T Android (he says he was using it with another carrier). I did some research and used CWM to put CM Android 4.2.2 on there. Thinking I'm all good, I ordered a SIM card from Ting and ported over my Verizon number to it. I go to use the SIM card and the phone prompts me for a SIM unlock code! In doing some more research, I found that I should have a Baseband Version, but that currently reads as 'unknown'. I DO have a IMEI number, though.
So what are my options? I've found a few threads about flashing a radio, would that clear up the SIM unlock problem or just give me a Baseband version? Again, according to my brother-in-law he has used this on other carriers than AT&T.
Thanks in advance!
A modem flash and adjustment of your APN settings may do the trick....
Those two items are required for a carrier change...g
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.
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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
Hopefully there is someone here more knowledgeable than myself that can help me. I recently ordered an S9+ SM-G9650 model from amazon with the intent of unlocking the bootloader, etc. When I got it, everything looked alright, but I got to a point in the setup when I couldn't progress without putting in a sim card. I did and it rebooted twice, one of those times showing a blue screen that from my research seems to be related to CSC and changing the software region based on the sim card inserted. My sim card is a US Tracfone AT&T version sim card by the way. After that, I finished setting up the phone and found the model number to be SM-G965U1. I have factory reset from the bootloader and from within android to no avail. From my research the CSC region change thing can only change the CSC values to certain values based on the phone's actual model number, and not the model number itself. What I am saying is, is it possible that my US sim card somehow changed my phone from the bootloader-unlockable SM-G9650 model to the locked SM-G965U1 model, or did I actually receive the wrong model device?
cosmogroid said:
Hopefully there is someone here more knowledgeable than myself that can help me. I recently ordered an S9+ SM-G9650 model from amazon with the intent of unlocking the bootloader, etc. When I got it, everything looked alright, but I got to a point in the setup when I couldn't progress without putting in a sim card. I did and it rebooted twice, one of those times showing a blue screen that from my research seems to be related to CSC and changing the software region based on the sim card inserted. My sim card is a US Tracfone AT&T version sim card by the way. After that, I finished setting up the phone and found the model number to be SM-G965U1. I have factory reset from the bootloader and from within android to no avail. From my research the CSC region change thing can only change the CSC values to certain values based on the phone's actual model number, and not the model number itself. What I am saying is, is it possible that my US sim card somehow changed my phone from the bootloader-unlockable SM-G9650 model to the locked SM-G965U1 model, or did I actually receive the wrong model device?
Click to expand...
Click to collapse
More than likely wrong model. It didn't change the bootloader. I run a9650 on cricket. I would send it back and raise hell i see this happen a lot
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
What are the "TMB" and "USC" in the "Update info" links?
They're both US unlocked.
doc.samsungmobile.com/SM-S918U1/TMB/doc.html
doc.samsungmobile.com/SM-S918U1/USC/doc.html
They correspond to the CSC (Consumer software customization) determined by your SIM card. If you're on T-Mobile, you will see TMB. If your'e on US Cellular, you'll see USC. On an Unlocked U1 phone, there may be carrier specific changes with an update.
Guyinlaca said:
They correspond to the CSC (Consumer software customization) determined by your SIM card. If you're on T-Mobile, you will see TMB. If your'e on US Cellular, you'll see USC. On an Unlocked U1 phone, there may be carrier specific changes with an update.
Click to expand...
Click to collapse
And if someone changes their service, can the old updates that were for the old carrier pose a potential problem now that they're with the new carrier and receiving their updates?
When you remove the old SIM card and insert the new one, it will ask you to restart to apply the correct settings for your carrier. The SIM does the work for you.
Guyinlaca said:
When you remove the old SIM card and insert the new one, it will ask you to restart to apply the correct settings for your carrier. The SIM does the work for you.
Click to expand...
Click to collapse
I assumed that was just changing the APN and changing the carrier settings. But it actually undoes old updates and reinstalls them?
No. Every firmware and update has CSCs built in. It doesn't revert the software, it just activates features specific to your carrier (based on SIM). It's a partition of sorts.
Guyinlaca said:
No. Every firmware and update has CSCs built in. It doesn't revert the software, it just activates features specific to your carrier (based on SIM). It's a partition of sorts.
Click to expand...
Click to collapse
1) So when one switches from carrier one to carrier two, what happens to all the past updates that are associated with carrier one?
2) If the SIM card is removed and a new one isn't inserted (for instance if one's upgading to a new phone), will the future updates be "generic"? (Obviously when the old phone is in one's home with a wifi connection.)
1. Each U1 software update contains all US carrier CSC partitions. If you update from A7 to A8, and change SIM cards, you'd remain on A8, but the CSC partition switches to the new carrier. There is never any rolling back, merely switching from one partition to another.
2. If you remove the SIM, your phone updates using the previously set CSC. If you used a T-Mobile SIM, it stays on TMO. The default CSC on U1 is XAA and there's little reason to go back to it, though it can be done with certain tools.
Guyinlaca said:
1. Each U1 software update contains all US carrier CSC partitions. If you update from A7 to A8, and change SIM cards, you'd remain on A8, but the CSC partition switches to the new carrier. There is never any rolling back, merely switching from one partition to another.
2. If you remove the SIM, your phone updates using the previously set CSC. If you used a T-Mobile SIM, it stays on TMO. The default CSC on U1 is XAA and there's little reason to go back to it, though it can be done with certain tools.
Click to expand...
Click to collapse
Thank you.