Can i change the service on my iphone 4s from AT&T to Sprint?

Ive had my Iphone 4s for about a year with AT&T and my contract is about to expire. Is it possible to just take my phone to sprint and start a contract with them? Or does my phone only work with AT&T? It would save me about 10 bucks a month on my phone bill.

If you terminate your contract by paying the termination fee, then yes, you can join a sim only contract with Sprint:)

That would be impossible. You can't get a 4S from a GSM carrier on a CDMA one (Sprint, Verizon, Cricket, Metro PCS, etc.) ever. Even though it has a CDMA antenna it's not functional unless you get it from a CDMA carrier.

That and Sprint won't activate a non-Sprint phone.