How does Apple set SMS lock?

Take the Apple 8 mobile phone as an example.

operation sequence/order

1. First, click the "Settings" icon on the main screen of the mobile phone to open the application and enter the detailed panel of the application.

2. Then enter the setting operation interface, find the "General" option, and click Open.

3. After entering the general operation interface, find the "access restriction" option and click Open.

4. After entering the access restriction operation interface, find the "Enable access restriction" option and click Open.

5. After entering the operation interface that enables access restriction, find the software option that needs to be locked, and click the switch button to close.