Sometimes it may be that your child has met someone on Facebook and they want to have a physical meeting, as a parent it is important that you do a background check. It may also be due to prank calls or phone harassment. Whatever the reason, with the advancement in technology, you can find out more about a number very easily. At the end of this video I am going to provide you a link with a special discount on how to search an unlisted phone number.br There is an online search site that will allow you to do a search on a particular number and get the details of the number.br A reverse phone detective site works with the same principle as the online phone directories where you start your search with a phone number instead of the name of the person. The problem with such big online directory sites is that they only work best with landlines.