IPhone 4S to 4? Different Carrier?

My iPhone 4S broke, and my sister gave me her old iPhone 4, which was for Verizon. It has no sim card slot, so if I go into the AT&T store, will they be able to put my service onto the iPhone 4? Or is it carrier specific?

It's specifically made for CDMA network and locked to Verizon. You can't use it on Att.

You can't do that you will have to activate the iphone 4 through verizons store and make them restore it from your recent 4s back up. And you will have to deactivate that 4s which also has a termination fee thats around lik 300 dollars.

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