Hello my friend ! I have the same problem as you. I send my P907a repair, they changed the motherboard and locked out the GSM network. I bought unlock codes and no works, it is the same IMEI and as often happens to be the same code.
I do not know if there is a way to unlock GSM network, but whatever I have to do I will, for example change the IMEI. Someone who can help us? Anything is welcome. Best regards
---------- Post added at 03:22 AM ---------- Previous post was at 03:17 AM ----------
Please someone answer. AT & T no longer supports this pileup, no OS updates, no Roms, nothing ... we are in limbo.