How does Apple 12 intercept harassing phone calls and text messages?

I believe that friends who use iPhone must have encountered endless harassing text messages, and most of them are sent by email. So how does the iphone intercept strange text messages? Let's take a look ~

How does Apple 12 intercept harassing phone calls and text messages? 1. Open the settings of Apple's mobile phone and click the information option.

2. Turn on the switch to the right of the person who filters unknown files.

3. Turn on the phone settings, turn on the phone, and turn on the switch to the right of mute unknown calls.

This paper takes iphone 12 as an example and applies it to ios 14 system.