How does Apple 5s set the function of intercepting messages and calls outside the white list?

Apple 5s can use the system's "do not disturb mode" function to set the white list. The specific operation method is as follows:

Click the "Settings" icon to enter.

Click Do Not Disturb Mode, and then click Start Manually. When the "Do Not Disturb" mode is enabled, the moon icon will appear in the status bar at the top, and incoming calls and text messages will be muted.

You can set your own time. When the "Do Not Disturb" mode is enabled, the SMS phone will be muted for a set time.

Allow these people to call is a white list of incoming calls. "Allow these people to call" can set contacts and groups, and whitelist calls will not be processed.

After the "repeat call" setting, if an incoming emergency call is intercepted, the call will be added to the white list, so that the emergency call will not be missed.