How does it know which calls to block? – Nomorobo HelpDesk
https://nomorobo.zendesk.com/hc/en-us/articles/205761855-How-does-it-know-which-calls-to-block
WebFollow. Nomorobo utilizes a MASSIVE database of known, illegal robocallers, that we've compiled with the help of the FTC, user reports, and our own honey traps. The blocklist contains over 5 Million robocallers and grows every single day. If a call gets a match in our database, we grab the call. If there's no match, we let the call go through.
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