WhoCallsMe

WhoCallsMe is a reverse phone directory in which people may put in a number in order to find out the number's source. They do investigative work as well in order to find out who the real person behind false numbers are. In the words of the site it's self;

"This is a user supplied database of phone numbers of telemarketers, non-profit organizations, charities, political surveyors, SCAM artists, and other companies that don't leave messages, disconnect once you answer, and simply interrupt your day.

If you received a strange call, unwanted SMS message, or just came across a number you don't recognize and want more information about, most likely you are not the only one. Search for this phone number to see the reports of others. If there are no reports yet, leave your comment to start a conversation." - WhoCallsMe 2014