Will a verizon or sprint iphone 4s work on an at&t network?

I want to buy an iphone and i have at&t I'm just wondering if i could use a verizon or a sprint iphone 4s on an at&t network.

Yeah about sprint you need a gevey or something with the same function. Not sure for Verizon but pretty sure it will

No.AT&T is GSM, Verizon and Sprint are CDMA.

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