HTC 8X - Manual (Page 19)

Pinch the screen to zoom out of the picture or text.
Motion gestures
Use motion gestures to mute the ringer and more.
Flip to silence
When a call comes in you can turn your
phone over to mute it.
Pick up to lower volume
In a business meeting or restaurant, pick
your phone up when a call comes in to
lower the ringtone volume.
19 Your first week with your new phone