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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