Forum Discussion
Samsung Tab S9+ 5G connectivity
It seems that the brains at T Mobile help have no answer to this question, so maybe someone here on the forum does. Why can't I purchase a Tab s9+ 5G tablet with T Mobile as carrier? I can get it wit...
The U1 are the US unbranded/non-carrier specific SIM unlocked devices. All U, U1, and W devices have interchangeable firmware but it is best to make sure the device is SIM unlocked first because each SIM locked device can only be SIM unlocked on the original carrier firmware.
Even though my s23 Ultra was purchased from T-Mobile. As soon as it was SIM unlocked, I flashed it from the TMB U firmware to the U1 firmware.
You can always tell the original firmware the device shipped with because one of the codes can't be changed. Not even with root or flashing.
If you look at the 4 things in the Service Provider Software Version. The first one (TMB in my case) of the four can't be changed. The second (TMB) is the SIM 1 carrier CSC, the third is the firmware model version (XAA is the U1 non carrier specific firmware), and last is for the eSIM (XAU), which is for an international SIM, which is my Canadian eSIM.
