How to unlock a verizon iPhone 4s?

So my friend gave me an iPhone because he wasn't using it. He had verizon though and I have AT&T. I went to the AT&T store and they said once I unlock it, they can transfer a sim that would fit the iPhone(currently have an android that doesn't have a sim that would fit) I'm trying to find a way to unlock my phone without having another sim or anything. Is there a way I can unlock it through a jailbroken source?

If your friend has completed his contract on Verizon, he can take it to Verizon and get it unlocked. If that's a problem, then you can get it unlocked from outside. If you need to get the Verizon iPhone 4S factory unlocked, mail me for references.

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