Why didn't it appear on the screen when I received the message? What is the reason and how to set it up?

1. Do not display the incoming call information screen of the mobile phone. Maybe this function is not set on the mobile phone.

2, first open the phone, find the settings, enter the settings page.

3. In the settings window, find the screen lock and security function, and click Enter.

4. In the new window, locate the notification and click to change the settings.

5. Click "Display the notice on the lock screen" in the first line, and select the display content in the pop-up window. After this setting, any information will be displayed on the lock screen when the mobile phone is not in the operation lock screen state.