First of all, there may not be a prompt to open the lock screen. The opening method is as follows: open the settings, notification and status bar, notification management, and set an icon in the upper right corner to hide sensitive notification content when the device is locked. In the notification center, the display screen is turned on, and the display screen on the lock screen is also turned on. When unlocked, select the banner as the reminder style. In Settings, General Functions and Help Functions, the flashing LED indicates that the reminder function is turned on. Open these!

2. Turn on the control center of the mobile phone and turn off the Do Not Disturb mode. Sometimes we accidentally open the do not disturb mode and forget to turn it off; You can prompt for information when you open it.

3. And looking for that may be to see if the mobile phone is broken first, hoping to help you.