How to set the white list only for mobile phones?

Take the iPhone 6 mobile phone as an example, the setting method is as follows:

First find the "Settings" item on the phone desktop, and then click Enter.

2. After entering the setting interface, find "Do Not Disturb Mode" and click Enter.

3. After entering the Do Not Disturb mode, turn on the "Manual on" switch and click "Allow these people to call" to enter.

4. Check "All Contacts" after entering, so that the mobile phone will only answer calls from the address book.