If you are trying to locate the name and address of someone whose cell phone number you have but you cannot find the number listed in any directory or phone book, then you can use a service called the reverse cell phone number lookup. Such services are run by companies who purchase the rights to access databases of mobile service operators with information about cell phone subscribers. This database allows users of the services to find people they are looking for because these directories are a huge pool of information with details of names, addresses, land-line numbers, etc. Most companies that possess this information are made to sign agreements which prohibit them from giving out this information for free. Advertisements that claim free cell phone reverse lookup are actually not completely true. Most companies that claim to conduct free reverse cell phone number lookup with name will actually just tell you that they have the information but to get the info you will need to pay a fee. In order to get the details of the person you are trying to find, you need to have a valid credit card account so that the company can be assured that the information is not being used for something that is not legal. Another reason why these services are not free is because they need to make up for the money that they are charged by mobile service operators. Most companies that provide reverse cell phone number search services give you information like the name of the cell phone user and the address. If need be and for extra fees, they can provide you with additional information.