Online phone directories, such as Whitepages, Intelius and AnyWho, typically offer both free and paid services. Free services include the ability to search for business and residential landline phone numbers; however, unlisted or cell phone numbers may be offered for a fee.
To perform a phone number search, a user enters a name, address or ZIP code, and a listing of possible matches generates. Each listing includes the full name, address, location map and list of possible connections associated with the person.
Users may also perform a free reverse phone number search to find the owner of a listed phone number. Additionally, advanced options are available for a fee, such as background checks, social profiles, marriage and divorce records and address history.