Find "Phone Ringtone"
Scroll to the profile icon and press the Navigation key.
Scroll to Change Sounds and Alerts and press the Navigation key.
Scroll to Phone Ringtone and press the Navigation key.
Select ring volume
Scroll to Volume and press the Navigation key.
Highlight the required ring volume and press the Navigation key.
Save and exit
Press the Menu key.
Scroll to Save and press the Navigation key.
Press Disconnect to return to standby mode.