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A comment on Ask HN: Why can’t I block all incoming calls that aren’t in my contact list?. Parent comment

Re:Ask HN: Why can’t I block all incoming calls that aren’t ... by troyvit on Wednesday January 30, 2019 @10:46AM (#19035986)
Yeah. This is so much like greylisting for email, but simpler. Greylisting has been around since at least 2007 and most spammers still don't bother getting around it.
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