A reverse telephone directory can help you find out a lot about somebody even if all you initially know about him is his telephone number. You can enter that telephone number and locate a whole lot of interesting information about the person who owns it. Many of us have experienced this situation when an unfamiliar number turn up in our cell phones and then it gets disconnected. If the telephone number was a residence number then you can easily find out the owner of the number but if it was a cell phone number then what will you do? Every now and then even the telephone companies cannot help you. Reverse telephone directory is of great help because it provides information which includes the residential data together with the phone service of the person using it. Thus, it can also be used by any person and it will give you all the information you wish to know about a particular individual who is using the cell phone. Perhaps you see the number of a portable telephone on your caller ID and you don’t know to whom it belongs. You may be receiving a series of calls from a number you don’t recognize and the caller terminates the call each time you answer. Or, maybe there is a cell phone number on your mate’s mobile and you want to know that caller’s identity. Alternatively, you might be missing calls repeatedly from an unknown number. There could be numerous explanations as to the reasons you would like to know the information about the owner of that telephone number. Assistance can be provided by a reverse telephone directory. It gives you the ability to find unlisted phone and determine an address by phone as well. The free reverse look up web sites only provide minimal information that may not provide information relevant to what you are looking for. If you choose to sign up for a membership, you will be given the opportunity to look up many numbers. These directories, have taken a large amounts of information and accumulated it into a ice application, and usually they charge significantly less for their service.