Will an unlocked iphone 3g work with Verizon if i put in an AT&T sim card?

I got a friend's iPhone 3G, it was originally AT&T but i unlocked it, can i use the AT&T sim card that was originally in it and have it work for verizon?

Verizon doesn't have sims so how would you be able to use verizon on it, when an iPhone gets unlock it unlock for any SIM CARDS you could get an iPhone 4 for Verizon though

No cos verizon is cdma network.

Verizon is CDMA, which doesn't use SIM cards, like AT&T which is GSM. They're incompatible.