How to change Verizon iPhone 4s to at&t?

The original owner is in jail and can't release the phone yet sold it to me. I have at&t and want to transfer to my account how can I get around this?

No, AT&T and Verizon use two totally different technologies.AT&T is gsm and uses sim cards and Verizon is cdma and does not use sim cards. Sorry…

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