Find "Call ringtone"
Press Menu.
Scroll to Settings and press OK.
Scroll to Profiles and press OK.
Highlight the active profile and press Options.
Scroll to Edit and press OK.
Scroll to Call ringtone and press OK.
Select your ring tone
Highlight the different ring tones to listen to them.
Once you've found a ring tone you like, press OK.
Exit
Press Disconnect to return to standby mode.