Iphone carriers, does it matter if its different?

My brother gave me his old Iphone4. The carrier is AT&T I have sprint. Can I still change it over to my plane? I didn't think it matterd since people buy Iphones over the internet all the time. We already have 1 Iphone on our plan(my husbands)… So is there a difference?

The sim card is what matters. The iphone 4 and the 3s have different sims.same with the 4 and 5. You can go to the sprint store and tell them to give you a sim that can fit into the phone and it will be with your service. Take out the at&t sim and put the sprint one and your set.

The iPhone 4 had a GSM & a CDMA model. One can't work on the other.AT&T is a GSM network whereas Sprint is CDMA. Same applies here.

CDMA networks don't use SIM cards. Only GSM ones do.

Probably my mom gave me her iphone 4 so she could get her iphone 5, all you gotta do i talk to your company and they'll straighten it out

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