A teenager in New Jersey has broken the lock that ties Apple’s iPhone to AT&T’s wireless network, freeing the most hyped cell phone ever for use on the networks of other carriers, including overseas ones.

George Hotz, 17, confirmed Friday that he had unlocked an iPhone and was using it on T-Mobile’s network, the only major U.S. carrier apart from AT&T that is compatible with the iPhone’s cellular technology.

While the possibility of switching from AT&T to T-Mobile may not be a major development for U.S. consumers, it opens up the iPhone for use on the networks of overseas carriers.