Will my AT&T Sim Card Work on My Verison iPhone 4S?

My version iPhone has a sims card slot on the side, so do i need some tool to unlock it for me?

Added (1). Ok so how do I unlock it?

I think thats suppose to say Verizon? If so then no. Verizon and AT&T both use different technology in their phones.AT&T and T-Mobile phones can work together. Sprint and Verizon phones can work together but that is it, and thats onlyif you have the phone unlocked.

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