yes you can, just need to do what is called an ESN change. now, if the two phones that are switching are on different accounts, you need to have the account holder for both accounts to be present when calling in.
you also need the ESN MEID or ESN DEC number for both phones. this can be found under the battery on the phone on a white sticker. it might also be called an ESN HEX number
btw, no it doesn't extend contracts or cost anything to do this
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