The best way to trace a phone number is to use a high quality and reliable service to help you uncover such information as their name, address and other info just from their phone number. These services allow you to find out this information on the back of private companies efforts to compile the most comprehensive and up to date list of information possible, to find out who called. This means that, since these companies have been able to find out as much information as you need and then managed to put it all into a giant database of millions of records, you can then search for the information just with the phone number.