What's wrong with oppoR9 mobile phone sending messages without sound?

The message of oppoR9 mobile phone is silent, because the notification function of message is turned off.

Turning on the notification function of information can solve this problem, and the specific steps are as follows:

First turn on the phone, find "Settings" on the phone desktop, and click Enter.

2. After entering the settings, find the column of "Notification and Status Bar" and click Enter.

3. After entering the notification and status bar, find the item "Notification Management" and click Enter.

Four, after entering the notification management, down the menu to find the "information" column, click enter.

5. After inputting the information, turn on the switch in the column of "Allow notification", and you can choose to turn on the switches of "Notification bell and vibration" and "breathing light flashing", so that the reminder will be obvious when the information comes.