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Re:Let’s Destroy Robocalls by egypturnash on Monday March 04, 2019 @01:48PM (#19304029)
Contacts-only whitelist with some work:

Default ring: silence, no vibration. Custom ringtone for everyone you actually want to pick up the phone and talk to. Yeah you gotta spend some time setting it up for your existing contacts, then spend 5s selecting a ring when you add a new contact.

Re:Let’s Destroy Robocalls by Someone1234 on Monday March 04, 2019 @01:53PM (#19304086)
This seems like an iOS specific work-around.

On other platforms they simply give you the choice to block non-contact calls. I can do so on my Pixel by leaving Do-Not-Disturb on with Contacts Only.

Re:Let’s Destroy Robocalls by timstapl on Monday March 04, 2019 @05:08PM (#19306080)
I've done this on my Pixel 2 for some time, however it no longer appears to work. Have you experienced issues with this on recent android updates?