Oppor 17 sends messages without prompting.

This is because there is no function to turn on the screen lock notification to light up the screen.

OPPO R 17 mobile phone opens the lock screen to inform and light up the screen. The functions are as follows:

First, click "Settings" on the mobile phone desktop, as shown in the figure below.

2. Then select the "Notification and Status Bar" option in the setting interface, as shown in the figure below.

3. After entering, just turn on the switch in the column of "Notice of screen lock when coming", as shown in the figure below.