Unlocking a Verizon iPhone 4S with sim card slot?

I bought an iPhone 4S off of Craigslist. I'm currently using a T-Mobile plan but the iphone is already using a verizon plan from the previous owner. The iPhone does have a sim card slot in the side so can i put in my t-mobile card slot?
How would I "unlock" it from verizon?
Any help is appreciated.

The previous owner should have called Verizon and had it unlocked before selling it to you. Verizon would unlock it for him, so contact the seller. Assuming the phone was paid off, if not, it won't unlock.

You'd have to get Verizon to unlock it, but they typically only unlock phones for international use, and generally you have to already be a Verizon customer in good standing for like 60 days for them to do it.

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