Yes, there are reverse phone directories available for people to use for free including 411.com and AnyWho.com. Users also run free reverse phone searches by using the tools supplied on WhitePages.com. No registration or membership is required to perform basic reverse phone look up searches on these websites.
The information most commonly found in the search results is the name of the account holder and the phone carrier associated with the phone number. In some cases, the physical address of the account holder is also provided. The information is gathered from different online information databases including online official public record portals.