What's wrong with oppo mobile phone receiving short messages without sound?

There are two reasons for this. One is that the anti-harassment function of information may be turned on, and the other is that the notification bell and vibration of information may be prohibited.

First, turn on information to prevent harassment.

1. Go to the desktop and click Settings.

2. Find the information option, and then click Enter.

3. If the button on the right of information anti-harassment is on, just turn it off. If it has been closed, it may be the following.

The second reason is that the information notification bell is not turned on.

1. Go to the desktop and click Enter Settings.

2. Locate the notification and status bar options, and then click Enter.

3, click on the notification management.

4. Find the information option, and then click Enter.

5. Then click the button to the right of the notification bell and vibration to turn it on.

This answer applies to all OPPO models.