What should I do if the notification bar of oppo mobile phone is not displayed?

Solution that mobile phone status bar can't display SMS notification;

For versions 1 and ColorOS 3.0 or later, you can go to Settings > Notifications and Status Bar > Notification Management > Messages > turn on the relevant notification switch and try again.

2. for other versions, you can go to settings > security and privacy (security service) > notification center > turn on notification (display information notification in the status bar) and try again.

This answer applies to all OPPO models.