Sprint/Verizon is CDMA
ATT/T-Mobile GSM
So a sprint phone wont work on ATT's network at all as they use different frequencies bands for LTE also.
It WILL work on the ATT network (if it's not SIM locked) but not on LTE bands.
ALL of Apple's phones are 5-band GSM, but they ship two models in the states. ONE is VZW/ATT/TMO and the other is Sprint.
The question is
1) can you buy it without contract or any other obligation from apple? (I think the answer is no).
2) Is it SIM-Locked? (I think the answer is yes).
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