How to Block calls from numbers not in my contact list

Settings>Apps>Phone>Silence Unknown Callers.

Turn that on.

“How to Block calls from numbers not in my contact list: I want to block telephone calls received from numbers which are not in my contact list. iPhone 13 please tell me how to do this.”

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Blocking Phone Numbers:

If you don’t want to receive calls from scammers…

Use of Malwarebytes Mobile Security:

If you were to use Malwarebytes Mobile Security then that would block known scammers from even going through —so, your wouldn’t even see them in your call history. It blocks out suspected scams, based on the sender's phone number. The paid version lets you report a number - once reported, it blocks it out, not even allowing it to go through.  Malwarebytes is created by longtime users of these forums, making it the only reliable Security Software for Apple devices. Go Here: Malwarebytes Mobile Security - App Store

Go to Settings/Apps/Phone (settings/Phone if you are not on iOS 18) and turn on Silence Unknown Callers.