Free reverse lookup exists and can be found online. As of May 2015, the reverse lookup service is available on websites such as yellowpages.com, peoplesmart.com, whitepages.com, spydialer.com and reversephonelookup.com.
After running a reverse phone lookup at peoplesmart.com, information on the phone owner is available for viewing only after users enter their details such as their first name, last name and email. At yellowpages.com and reversephonelookup.com, search results are instantly ready for viewing. Such information includes the name and address of the phone owner. Known relatives of the phone owner are shown at whitepages.com. There is also an option for photo lookup at spydialer.com.