HTC DROID Incredible - Manual (Page 43)

Basics 
Closing the Notifications panel
Do one of the following:
Press and hold the bottom bar of the Notifications panel, then
slide your finger up the screen.
Press BACK
.
Adjusting the volume
Adjusting the ringer volume changes the volume level of the phone
ringtone, whereas adjusting the media volume changes the volume
level of sound notifications, music or video playback. The ringer
volume and media volume can be separately adjusted.
Adjusting the ringer volume
Press the VOLUME UP or VOLUME DOWN buttons on the left
panel of the phone to adjust the ringer volume to your desired
level. The Ringer volume window appears on the screen to
display the volume levels. While in the lowest ringer volume level
(Silent mode), press VOLUME DOWN once to set your phone to
Vibrate mode. The phone vibrates and the vibrate mode icon
( ) appears on the status bar.
While in Vibrate mode, press VOLUME UP once to switch to silent
mode. The speaker mute icon ( ) displays on the status bar.
To quickly switch your phone to silent mode, press and hold the
POWER button, and then tap Silent mode on the options menu.
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