How do you know who a phone number belongs to?

To find out who a phone number belongs to, a reverse phone number lookup can be done. Entering the number into a service provider's online search box and clicking "Enter" gives information such as the user's full name and address linked to that specific landline or cellphone number.

The reverse phone lookup, also called the gray pages directory, can only be found online. There are free and paid sites that offer this type of service. For a low sum of money, a paid site will provide a one-time report on the number. However, locating a reputable free site is difficult.