White Pages, Spy Dialer and Reverse Phone Lookup are websites that reveal who owns a phone number when users enter a number into a search field. White Pages also offers a free download that lets cellphone users block unwanted numbers and identify unknown calls and texts using caller ID.
Spy Dialer finds the owners of cell phones, landlines and some unpublished numbers. It uses publicly available data from social media to find the information and offers a maximum of three lookups a day for free. Reverse Phone Lookup offers an unlimited number of searches for free and identifies the owners of both cell phone and landline numbers. An owner's first name, last name and address populate when a match is made.