How does Apple's mobile phone intercept short messages from strangers?

The interception of SMS by Apple mobile phone can be set in the settings, and the method is as follows:

Tools/materials: iPhone 12, iOS 14.5, settings 1.0.

1. First, open the settings indicated by the arrow on the mobile phone desktop.

2. After opening the settings page, click Info.

3. On the subsequent page, click the blocked contact.

4. Click Add.