How to Automatically Block Unknown Callers on iPhone (iOS 13.3)?
Step 1: Open 'Settings' App.
Step 2: Scroll down, and then tap on 'Phone.'
Step 3: Scroll down to 'Call Silencing and Blocked Contacts.' Under that, Tap on Switcher next to 'Silence Unknown Callers' to make it 'On.'
Step 4: After that, you can close the 'Settings' App.
It's done.
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