New top story on Hacker News: Ask HN: Why can’t I block all incoming calls that aren’t in my contact list?

Ask HN: Why can’t I block all incoming calls that aren’t in my contact list?
148 by tones411 | 141 comments on Hacker News.
It’s pointless to block every single spam number that can call in. If we can’t end spam calls, why don’t phones let you at least block all except numbers in your contact list?