I am going to go over some of this here. The first thing you need to realize is that phone numbers are usually entered in a lot of spots on the internet. You can actually find these with reverse cell phone directories.

The thing to look for when finding a reverse cell number is if the data is updated. You can usually tell right away when you enter the number you are looking for in the search. Usually when the service is outdated it will not bring anything up that you recognize, but if it pulls up what you recognize then its all good. These are just a few things to consider when doing a cell phone reverse number look up. Good luck!