Apple's 1 1 lock screen is loud and small.

This is caused by an error in the mobile phone sound system, and the solution is as follows:

1. First, open the Apple phone and click the "Settings" icon, as shown in the figure below.

2. Then click the "General" option in the opened settings page, as shown in the figure below.

3. Then click the "Restore" option in the opened "General" page, as shown in the following figure.

4. Then in the page that opens, click the "Restore all settings" option, as shown in the figure below.

5. Finally, turning off the phone and restarting it can solve the problem that Apple 1 1 locks the screen loudly and quietly.