Change Your Ringtone
You can change your ringtone in My Stuff or Settings. You can also download ringtones from the AppCenter.
Through My Stuff
From the home screen, press the Right Soft Key for Main Menu and select My Stuff (0).
Select Music > Ringtones.
Press 
to preview a ringtone. 
Highlight a file and choose Options.
Select Set as (1) > Voice Call Ringtone (1).
Through Settings
From the home screen, press the Right Soft Key for Main Menu.
Select Settings (#) > Profiles.
Highlight a profile and choose Edit.
Choose Voice Call Ringtone.
Highlight a ringtone and press 
to select it.