How does Apple set up harassing SMS to intercept sales calls?

Take Apple 1 1 as an example, the system version is iOS 14. 1, and the method of setting up the interception of sales calls is as follows:

1, find the settings on the phone.

2 Open the phone settings and find do not disturb mode;

3. After opening do not disturb mode, click below to allow the following calls;

4. Then choose personal favorites, so that only a few designated users can get through to your mobile phone.