The majority of online reverse telephone lookup services are free to use. Many sites perform a variety of reverse searches free of charge.
As of 2015, a good reverse telephone lookup service is the White Pages. If the phone number is public the user can be provided with a first and last name, address and in some cases the name of the telephone carrier.
Another free site for reverse searches is People Smart. This website is updated often and provides the most current information on a phone number. People Smart does not share search information with other parties. The site also offers free reverse email, address and people searches.