AT&T not recognizing my AT&T device

Re: AT&T not recognizing my AT&T device

if I flash t-mobile will that put all their bloatware on the phone tho?
No , your sim dictates what goes on the firmware as all carriers and unlocked firmware are universal, you might be on a different build number Tmobile from Att and not get OTA updates until u get on same build as Att but can just flash through odin with next update just use Home csc so no factory reset
 
I just flashed the TMobile file and the first thing to come up on the phone is AT&T logo. I would have never know this without your help! Thanks!
 
I can also confirm that AT&T number sync will not work on unlocked S21 ultra and im assuming other unlocked devices as well.
 
Question when you were on the unlocked firmware did that image disappear 5GBYOD ?
 
No it did not disappear. AT&T still couldn't figure it out. Now that i did some flashing and im back on AT&T firmware ill check and let you know if its fixed or not.
 

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