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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 maxxxxx on Wednesday January 30, 2019 @10:00AM (#19035516)
This is hacker news so this kind of solution is cool. And whatever the big guys are doing this user can always change his approach to defeat the spammers. Not globally but just for himself.
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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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Re:Ask HN: Why can’t I block all incoming calls that aren’t ... by StavrosK on Wednesday January 30, 2019 @10:06AM (#19035571)
I agree.
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