Reverse lookup for cell phone numbers

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Here at work we had a customer who shafted us on a pretty expensive job. It turns out that he gave us a bogus address and home/work contact numbers. I do have 2 cell numbers that I have been able to reach him on, but you can't get addresses from them with normal searches through Superpages and the like. I have been searching the internet and of course there are thousands of sites that say they can get me an address for a fee, but those could be scams themselves. Does anyone know of a reliable reverse cell phone lookup site or already have an account with one and could help me out?