How to handle application messages without notification?

There is a phenomenon that the application message is not notified on the mobile phone. You can try the following methods to deal with it:

1. Have you ever unlocked your phone? If so, I suggest you make a backup of important information and brush it back to the official system.

Please confirm whether the mobile phone system is the latest version. If not, I suggest you update the system to the latest version.

I suggest you check whether the settings are correct:

A, Android 10: Settings-Application and Notification-Click Application-Notification-Display Notification/Use Notification Point (here you can set whether the notification information is important or secondary).

B. Android 9: Settings-Applications and Notifications-Click Applications-Notifications-Display Notifications/Use Notification Points/Lock Screen Notification Display

C. Screen lock notification display: Set-Security and Unlock-Screen lock option; click the gear sign on the right-Screen lock notification display.

4. I suggest you lock the application in the background for a while to see if there is still no notice; (Lock mode: multitasking-select an application and click the lock icon in the three-point menu in the upper right corner)

5. I suggest you set-battery-battery optimization-three-point menu in the upper right corner-advanced optimization-turn off advanced optimization and sleep standby optimization; (This operation will increase fast power consumption)

6. If there is a problem with individual software, it is recommended that you back up the data, uninstall the software, re-download and install it in one plus store, and update it to the latest application version.

7. If there is something wrong with all the software, I suggest you back up the data, restore the factory settings of the mobile phone or brush the latest official system.

If the above methods fail to solve your problem, I suggest you apply for after-sales service, and the network engineer will check and handle it for you.