Ask HN: Why can’t I block all incoming calls that aren’t in my contact list?

Re:Ask HN: Why can’t I block all incoming calls that aren’t ... by balabaster on Wednesday January 30, 2019 @10:20AM (#19035706)

This would need to be spoofed for every individual though. I imagine this would be cost prohibitive enough that it would at least in the short term kill most spam phone calls.

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Re:Ask HN: Why can’t I block all incoming calls that aren’t ... by mark-r on Wednesday January 30, 2019 @11:39AM (#19036574)

On the contrary, it represents a revenue opportunity for the first person who can generate a list of matching pairs of phone number and friend phone number. I wouldn't expect the list to be prohibitively expensive because it will be resold thousands of time.

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