How to get an iPhone 4 from Verizon to work on AT&T?

I broke my iPhone and bought an iPhone off craigslist but made the mistake of buying one that was originally for Verizon not AT&T is there anything I could to to make it work?

An iPhone 4? Not a 4S? Nope, it'll never work on AT&T because it is a CDMA phone and AT&T uses GSM.

Not possible.
Verizon is cdma and att is gsm, not compatible

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