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Re:Ask HN: Why can’t I block all incoming calls that aren’t ... by zamalek on Tuesday January 29, 2019 @09:44PM (#19032168)
It's mostly built in for Pixel: it warns about spam calls under the caller ID and allows you to report spam. In addition, there's the new call screening functionality [1] (which also now works on the Pixel 2).

[1]: https://www.digitaltrends.com/mobile/google-call-screening-h...

Re:Ask HN: Why can’t I block all incoming calls that aren’t ... by MarkSummer on Wednesday January 30, 2019 @04:48PM (#19039910)
> It's mostly built in for Pixel

I this this "Pixel" reply is misplaced. I've been using "Should I Answer" for about a year on my Galaxy S6, and it does everything the OP was requesting and then some. I just donated to them yesterday for the first time in fact.

Even if you don't choose to use your contacts as a white list (which I don't because I often have client/prospect calls coming in that aren't in my contacts yet), it still catches about 95% of calls thanks to thepower of the masses fighting back.

If you don't have it, definitely worth a download