HTC Thunderbolt User Manual page 272

7 Photos, videos, and music
1.
Press HOME
2. Tap
3. In the Library, choose the song that you want to use as ringtone
and then play it back.
4. On the Playback screen, press MENU and then tap More > Set as
ringtone.
5. If you chose an MP song, you can trim it first and set the
part that you trimmed as the ringtone. See "Trimming an MP
ringtone".
6. In the Set as ringtone options menu, tap Phone ringtone or
Contact ringtone.
If you select Contact ringtone, you need to choose the contacts
you want to associate the song with in the next screen.
, and then tap
to go to the Library.
> Music.