Can I connect a used iphone to at&t?

So i lost my iphone & i was wondering if i can buy an iphone 5 from my friend which he had it connected to sprit before he got a new and i wanted to know if i buy it can i take it to AT&T and connect to my contract that i had already

A Sprint iPhone will not activate on AT&T.

You would need an AT&T phone.

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