Reverse Phone Detective
The Reverse Phone Detective is a website where you can find out the owner of any cell phone or unlisted number. The location of the phone is then shown tagged on a Google Map and it is also possible to get the name, current address and carrier details when available.
The service works for landlines and mobile phones. If you don't want to subscribe then you are only shown the tagged location of a searched phone. If you want the name, address and carrier details, you will have to pay to become a member or pay $14.95 for the details for each phone number that you wish to search.