Will my sprint iphone 4s work with at&t?

So I'm going to buy an Iphone 4s from my friend. But its sprint. And i have att… Will it work on att… I already have a sim card. From my old phone. That broke…

Yeah the phone isn't meant for only one company. They are transferrable you just got to call and set it up

No, two totally different technologies.

No, Sprint uses CDMA network infrastructure whereas AT&T uses GSM. They are not compatible.