How can I change the notification sound for text messages (SMS)?

1. From the home screen press the Menu button.
2. Move the cursor to Profiles and press the OK button.
3. Move the cursor to your current profile and press the Options button.
4. Move the cursor to Settings and press the OK button.
5. Move the cursor to Ring settings and press Select button.
6. Move the cursor to Message ringtone and press Select button.
7. Keep the cursor on Fixed ringtones and press the OK button.
8. Move the cursor to the ringtone you’d like to use and press the OK button.