I have the phone but haven't try using it outside of US yet. But based on other world phones I had with Sprint (HTC TP 2 and BB9650), the phone is unlock already, but the radio firmware ignore all AT&T and Tmobile towers here in the US even though the phone is capable to do so. But once you are out of US, you will be able to use any local SIM just like any other unlock GSM phone. At least that is what I did last year when I was in Sydney.