OPPO mobile phone has no message notification.

If a three-party application uses data traffic and wireless LAN without notice, you can try the following methods to troubleshoot:

1. If the notification Do Not Disturb is turned on, the notification bar will prompt the notification Do Not Disturb to turn on, just cancel the notification Do Not Disturb.

2. enter notification management: "long press the tripartite application icon > application information > notification management" to turn on the notification permission switch; Turn on the new message notification (other notifications, audio and video call invitation notifications) switch.

3. Turn off the notification switch set to unimportant/turn off the switch moved to the bottom of the notification.

A.ColorOS 12 version path: "long press the application icon >; Application details > notification management > turn on permission notification (different applications have different notification categories, and you can choose screen lock/banner, ringtone or vibration). "

B.ColorOS 1 1 version path: "long press the application icon >; Application information/application details > notification management > system default channel/system silent channel >; Set as unimportant notification "

C.coloros version path: "long press the application icon >; Application information > notification management > close move to bottom of notification "

4. long press the tripartite application icon to enter "application information >"; Power management ",turn on" Allow the application to start by itself "and turn on" Allow the foreground to wake up ".

5. long press the tripartite application icon to enter "application information >"; Traffic usage ",cancel" Disable mobile data "and" Disable WLAN ",and turn on" Data can be used in the background ".

6. go to settings > SIM card and traffic management (or mobile network) >: traffic management and turn off "traffic saving".