Can I convert my Verizon iPhone to AT&T?

Okay before you automatically say NO I'd like to point out I have the iphone4S on the Verizon network. I've heard that the newest iPhone model, the iphone4S is the only iPhone capable of switching over. Is this true? If so can it be done easily? Will it affect reliability or performance? I heard that on the older iPhones if you "jail broke" the phone it could be used on other networks but doing so could affect the phones realability. I want to know if the Iphone4s, currently being used on the verizon network, can be switched over to AT&T with ZERO issues or possibility of affecting the iphones functionality or realability. Or can it not be done? I heard the iPhone 4S came built for both GSM or CDMA but can't confirm if it's true.

Anything below the 4s won't work on att from verizon. The 4s may have a sim slot but unlocking it still might not let it function on a us gsm network…

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