It is often possible to find the listing for an unknown phone number by simply entering the number into a search engine, such as Google.com. If this fails to yield results, free phone search websites such as Whitepages.com and 800notes.com provide location listings and information on many unknown phone numbers.
In addition to offering location listings, 800notes.com also acts as a forum for users to share any information they have on the unknown number in question. Another way to find the listing for an unknown number is by searching the number on Facebook.com. Forbes.com reports that even if a person adjusts Facebook's privacy settings to hide his phone number, a search for the number often still link to that person's profile.