AT&T iphone4S work for verizon?

I have verizon but i need a new iphone- my friend has a 4S he'd sell to me- but it's AT&T---
would it work on verizon?

No, because AT&T and Verizon use two very different cell phone technologies: GSM and CDMA, and they are in no way compatible. Verizon is a CDMA company, so you need a CDMA iPhone, either one that was on Verizon or Sprint.

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