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Re:Ask HN: Why can’t I block all incoming calls that aren’t ... by nmstoker on Wednesday January 30, 2019 @05:44AM (#19034074)
Cool idea, but you're talking about a landline though aren't you?

The implication from the OP is that it's a question about mobiles. It's not 100% clear, but in my experience people rarely bother to have contact lists on landlines, which themselves are increasingly less popular.

Re:Ask HN: Why can’t I block all incoming calls that aren’t ... by StavrosK on Wednesday January 30, 2019 @05:53AM (#19034100)
Sure, but the point is that with this greylisting approach you don't need them.
Re:Ask HN: Why can’t I block all incoming calls that aren’t ... by tones411 on Wednesday January 30, 2019 @09:36AM (#19035314)
iPhone or Android. We don’t have a landline.