New answers tagged att
The technical issue with the 5 is that the AT&T models made in the first few months after release didn't support the 700Mhz band used by T-Mobile. You have to look at the serial number to know if your phone supports it. The details are in a tech note on Apple's site. Your phone will still work even w/o 700Mhz support but, as noted, in some areas it ...
AT&T and T-Mobile both use GSM networks. So yes, you will be able to use your iPhone with T-Mobile.
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