How to block unknown callers on Samsung Galaxy S20 5G - Android

Calls from private or unknown numbers can be a nuisance. Such calls from purposefully hidden numbers are often scams or unwanted spam that you may want to avoid. Luckily it's easy enough to block all unknown callers on your Galaxy S20.

What exactly are calls from unknown numbers?
Those are calls from people who have purposefully hidden their phone number when calling you, so that you can't call them back, or identify them. They may appear as "Unknown Caller", "No Caller ID" or "Private Number" when calling, whereas normally you'd see a phone number.

As we mentioned earlier, calls ...