The advisory tones have the following meaning: 

Advisory tone  Meaning  Key tone  Every keystroke is confirmed  Confirmation tones  Confirmation tone (crescendo tone sequence) when saving inputs/settings and when placing the handset in the charging shell Error beep (decrescendo tone sequence) to signal incorrect inputs End-of-menu beep at the menu end Battery tone  The battery must be charged

Open the main menu of the mobile phone. 

Select and confirm the menu item. 

Select and confirm the menu item.
 

Fix the setting. 

Move the cursor down one line. 

Save the settings.