OPPO mobile phone, why is there no sound in the text message?

Reason one:

1. Click Settings on the desktop to enter information.

2. Then close the anti-harassment message. If this function is turned on, the information of strange numbers will be muted (this function may not be available on some models).

Reason two:

1. Click Settings on the desktop-enter the notification and status bar.

2. Enter the notification management-click information.

3. Then turn on the notification bell and vibration.