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