I was told by Apple Support that anything ordered through Apple is Unlocked even if you order under one of the carrier plans like AT&T Next. We will see if that's true but it's what they told me. Ordering directly from carrier, however, I know AT&T's are locked and I believe Verizon as well. Don't know anything about T-Mobile direct. Again, going through Apple seems best.It is. GSM only unlike previous years, but unlocked.