With the internet it is possible to look up possible to look up personal information about an individual through either their name or phone number for free. The only thing is the free services only provide information for listed number from a standard reverse phone directory. If you want to track down information from wireless and cell phone numbers you will have to subscribe to a paid service. These services subscribe to very expensive extended reverse phone directory services and pass savings on the customers that only need limited information. Only you can decide which service will provide you with the information you need.