Setting method: Take iPhone 1 1 as an example, turn on the phone, click the setting button, enter the system setting page, select "screen usage time", click "Apply restrictions", enter the password, click "Add restrictions", click "Next", set the time, and then select APP.

Skills of using mobile phone: 1. Under the ios 12 system, you can delete the profile, turn on the mobile phone, click the Settings button to enter the system settings page, click General, and select Device Management. You can find "Profile Management" in the pop-up interface, and then delete the profile.

2. ios 12 can record, and open the voice memo to use this function.

3.ios 12 has a screen usage time function, which can check the number of times the phone is unlocked and set the deactivation time of the iPhone.

4.ios 12 can customize the control center. Turn on the mobile phone, click the Settings button to enter the system settings page, click Control Center, select Custom Control, select the function to be used, and then click the plus button to add.

Data expansion: iPhone 1 1 further improves the shooting effect of iPhone portrait mode, and can adjust the lighting position and intensity of light effect in portrait photos. Portrait mode also adds a light effect mode, called highlight monochromatic light, which can take portraits with strong contrast and unique style.