I know there are a few threads on AT&T's early termination fee, but: Got my wife an AT&T 64GB 5s for $399 plus sales tax on full value, on a new line. T-Mobile has just announced free global data on their unlimited everything plan - my wife travels internationally for her job, so considering switching to T-Mobile. Rather than buy a T-Mobile 5s, can we pay the $325 ETF to AT&T, then request a device unlock, then take it to T-Mobile and sign up there? It seems to be cheaper than paying $849 + tax for a T-Mobile 64GB 5s. Am I missing anything?