How to know the Iphone carrier info?

I bought an Iphone this week from craiglist. There's a sprint sim in it, which shows full signal strength. When i tried to make a call, the voice mail message shows account could not be validated. I tried one of the website with IMEI it says it is verizon locked. Now i'm helpless. How to know which carrier it is exactly locked sprint or verizon? How much will it cost for factory unlocking?

Oh boy. Do you have the number still of the people you bought it from? Maybe they can change the password and default settings back to factory settings. Not sure exactly how much it would cost to have verizon do it

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