AT&T Note 9 bought from AT&T store doesn't work
I've got 3 AT&T Note 9 that are AT&T branded and I purchased from AT&T store. All 3 are paid off in full. Using AT&T Straight Talk. They all were working just fine after the 3G shut down. All calls, texts & internet work without any problems. That was until I acquired the unlock code for all three of them and unlocked them so I could still use it when I travel. Used AT&T unlocking process through them and the moment my phone came back up after rebooting no longer could I make phone calls internet worked fine text messages picture messages fine all three of them exact same problem but I can take an S4 Mini AT&T branded not unlocked with the same SIM card out of my notes calls work just fine.
What I have found out is after they unlocked my device they changed the CSC code to where it shows Factory unlock note 9 instead of it being AT&T branded unlocked device