HTC Butterfly - Manual (Page 24)

Three-finger swipe
Swipe up using three fingers to share content such as
photos, videos, and music from HTC Butterfly to your
TV or speakers.
HTC gestures is enabled by default, making the three-finger gesture exclusive for
sharing content. You also won't be able to use multi-finger gestures (gestures that
use three fingers or more) in apps such as games or musical instrument apps.
To use multi-finger gestures in such apps, clear the HTC gestures option in Settings
> Display, gestures & buttons. This disables content sharing.
Motion gestures
Use motion gestures to mute HTC Butterfly, turn on the speakerphone, and more.
Flip to silence / flip for speakerphone
When a call comes in you can turn HTC
Butterfly over to mute it.
24 Your first week with your new phone