Thank you for your feedback!
How do I Change the Ringtone on my SGH-T199?
You can change the ringtone on your device.
Change Your Ringtone
To change the ringtone you hear when a call is received, from the standby screen, press Menu > Settings > Personalize > Sound profiles. Select one of the profiles listed, and press Options > Edit. Highlight Ringtone and press > Sounds > Sounds to select from the available list of ringtones.