My vivox7 mobile phone has no sound, only vibration, and the notification bar has not responded.

You can try the following methods to see if you can solve the problem:

Enter the notification authority to open information in Settings-Status Bar and Notification-Management Notification;

Go to Settings-Sound-Message Ringtone-Try to change other ringtones;

Maybe when you are using it, you click the clear notification option in the drop-down notification bar of your mobile phone. At this time, you just have a short message.

If SMS notification is turned off, you can click SMS-Settings-Notification Settings to turn on notification.

Abnormal data or settings, I suggest you restore settings to solve the problem. Go to phone settings-More settings-Restore factory settings-Restore all settings (this operation will not delete phone data).