The mobile phone doesn't ring, it just vibrates. What happened?

Cell phone alarm clock doesn't work. Suggestion:

1. Click the alarm clock-check whether the green light on the right side of the time is on.

2. Check the third-party software recently downloaded by the mobile phone. It may be that the software is incompatible with the mobile phone. I suggest you try uninstalling it.

3. Back up mobile phone data (phone book, SMS, multimedia files, etc.). ) and restore the factory settings (Settings-Reset-Restore Factory Settings).

If the problem still exists, I suggest you take the three-guarantee certificate of your mobile phone and send it to the nearest service center for testing.