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It needs to be unlocked and compatible. Not all iPhones work across all carriers. Which iPhone (5,6,7) are you wanting? The SE and 6 can cross-carrier work, but the 7/+ is specific as the T-Mobile and AT&T do not use CDMA and cannot cross to Sprint or Verizon and others from Sprint/Verizon CAN work on T-Mobile and AT&T.
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