Either AT&T did not unlock it, or you did not complete the process on your end.
See this document: How to unlock your iPhone for use with a different carrier - Apple Support
Either AT&T did not unlock it, or you did not complete the process on your end.
See this document: How to unlock your iPhone for use with a different carrier - Apple Support
Did you restore it through iTunes on your computer after you got the message that it was unlocked from ATT?
Yes, I used the unlock code and restored phone from iTunes.
There is no such thing as an "unlock code" for an iPhone. That is not how unlocking works.
Read this: How to unlock your iPhone for use with a different carrier - Apple Support
I bought this phone as a new phone. When I followed the unlock steps, I got the message that phone is unlocked. I called ATT and they confirmed that the phone is unlocked. Only when I took the phone outside the US and tried to insert a SIM there that I get the message saying unsupported a SIM. The same SIM on my old Nokia phone that was never locked before worked.
Hi rogerfromplano46. Was your phone new when you got it, or was it refurbished?
International unlock code
