There are plenty of benefits that could be offered by the lookup cell phone number service. These are being used by many people according to their own convenience and their own advantages. They are mostly used for tracing the owner of the number from which prank calls are received very often. These could be eventually stopped when the identity of the person is found. The cell phone directory service is used by the business managing people mainly to find the callers from those they have missed calls. There are many people who think they could choose the cell phone directory option to find numbers but there are very few of them who go ahead in finding these services. This service is also not found completely for all the numbers. The unlisted numbers would not be listed with any service provider as the caller might have the number registered with the do not call registry. These directories cannot be found online but the companies which have the database are effective ones.