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According to their website:
800notes is a FREE REVERSE PHONE NUMBER LOOKUP database built by YOU, its users. Our strength is in our numbers - by sharing pieces of information each of us has we are putting together a free and public phone number directory with information no other service can provide.
They have a *very* useful database of reports of spam or otherwise problematic numbers, going back to at least 2007; and they are under constant pressure from phone spammers and others who don't like being reported.