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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 muttled on Wednesday January 30, 2019 @11:42AM (#19036612)
Go the ReCaptcha route and have them listen to 9 sounds and tell you which one of them are store fronts.
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