Comment by al_borland

You can flip on the option in the settings to silence unknown callers. It does a decent job, and prevents a lot of the manual micro-managing. I will sometimes toggle it off if I’m expecting a call from an unknown number, but it will also pull numbers it sees in texts and email and known.

I manually set this up several years ago, to only ring for contract in my address book. It was annoying, but worked. At the same time, I submitted the feature request to Apple and it came to iOS about a year later.

I found my calls have gone down dramatically since using it. I used to get 3-4 calls per day. Now, even if I have the feature toggled off, I might get a couple calls in a month. Once the number appears inactive, I think it drops off a lot of lists.