well from my understanding any iphone off purchased off contract is unlocked. just do the unlock request for att. its online online. just google it
I did the firmware restore and iTunes said please insert a SIM. I put in my cut down T-Mobile SIM but it kept saying please insert a SIM card. So I may have butchered the SIM card when I cut it or when the phone is locked that is the message it gives.
Do you know if that is the message it gives when the phone is locked to AT&T?