How to unlock a stolen or lost iphone4s?

I bought this Iphone4s on craigslist and i don't know if its lost or stollen and i want to unlock it. I got an apple computer and i tried connecting it and it says "iTunes could not connect to the iPhone "IPhone" because it is locked with a passcode. You must enter your passcode on the iPhone before it can be used with iTunes." and of course i don't know it.
I tried *#06# and it still don't work. Is any way i can unlock it?

You need to hard reset it - restore it.

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