When Sony announced that they were teaming up with AT&T for the PlayStation Vita's 3G service, it was the only time I can remember at a major press conference when there were actual, audible boos.
And this is exactly why.
Turns out that the Vita is locked to AT&T sim cards, with The Verge reporting that "inserting a SIM from T-Mobile or an international carrier will not work".
America, you do a lot of things right, but your mobile phone carriers are the worst.
PlayStation Vita 3G is carrier-locked, says AT&T [The Verge]