Whitepages, ReversePhoneLookup.com and Yellow Pages offer free reverse lookup of any phone number. Site visitors enter the phone number, and listing information is provided, if available.
Whitepages provides basic information, such as names and addresses associated with the entered phone number. This site also provides an age range for the adults listed with the number.
ReversePhoneLookup.com also offers name and address data and includes details such as the original service provider and original service type. Yellow Pages allows reverse lookup of any landline number but not cell phones. It provides basic contact specifications as well as links to purchase additional information related to the phone number's owner.