Can I unlock a iPhone 4 that's on AT&T so that it can work on Verizon?

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i was given iPhone 4 that was on AT&T and i want to know if it's possible after its unlocked (it's not unlocked yet it just has no service) for it to be put on Verizon

[vicecaptain]

AT&T is a GSM network operator and Verizon is a CDMA network operator. You can unlock a GSM network phone to use with any other GSM network only. So, you can't unlock it to use with Verizon. If you still need to unlock your AT&T network locked iPhone 4 to use with any other GSM network, You can choose the remote unlocking service. This method of unlocking is the safest and simplest method to unlock an iPhone model. You can get the remote unlocking service for an iPhone 4 from www.Unlock-Zone.Com at affordable cost with free step by step unlocking instructions. This method of unlocking doesn't require a jailbreak too. All the best mate.