What should I do if the Apple 6 app icon is missing?

The icon is missing because the application has been deleted. Just go to the software store to download and install it again. If it is a system application, it can be restored by restoring the factory settings of the mobile phone. Take the iPhone 7 mobile phone as an example, the method of restoring factory settings is as follows:

First, click "Settings" on the desktop of iPhone 7.

Second, after entering the settings, select the "General" option.

Third, find the "Restore" item and click Enter.

4. After entering, select "Restore All Settings Options".

5. Then enter the password for verification. After verification, the phone can be restored to factory settings.