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This exists as an iOS feature. Not sure about Android.

• post_break 7y ago
  I currently can't do that. I can turn on DND and miss every notification, but I can't filter my calls with a whitelist.
  • huebomont 7y ago
    Settings > Phone > Silence Unknown Callers
    • musicale 7y ago
      Perhaps the best new feature of iOS 13. However, now I get a bunch of robocalls in voicemail, and iOS doesn't transcribe them properly because they're usually in Mandarin.