Do you need to find out whose cell phone number has been calling you (or your spouse or child)?. Cell phone numbers are particularly hard to trace because phone books are not obliged to print them. In fact, name and number lists are deliberately kept from being published as a way to prevent unwanted phone calls, because no one wants telemarketers calling their cell phones, right? So, to find out who owns any number that is unlisted, cell phone, business, fax and pager, you have to pay a small fee to perform a reverse phone search. Why? Because the reverse phone search companies paid for their data lists from third party providers such as cell phone companies and government record holders. To make things easy for you, the best thing to do is focus only on the best cell phone number search sites and compare them to see what information and price best fits your needs.