Is that different from Silence Unknown Callers in IOS 13?
I foiled myself and missed an important call the first time I used that setting. It was a call I expected, but not a contact.
Kinda! You can make an iOS shortcut to take you right to the Phone settings, at which point turning "Silence Unknown Callers" on/off is a one-tap operation.
To do this, create a shortcut to open the URL "prefs:root=Phone". You can find more detail and a bunch more interesting options here: https://www.macstories.net/ios/a-comprehensive-guide-to-all-...