HTC One Remix - Manual (Page 44)

Motion gestures
Use motion gestures to mute HTC One remix, lower the ring volume, and
more.
Flip to mute
If your phone is facing up when a call
comes in, turn the phone over to mute
it.
If you go to Settings and then tap
Sound > Flip to mute, you can set your
phone to:
Mute
once
Mute only once after
flipping the phone. While
the phone is still facing
down, it will ring again when
there are other incoming
calls.
Mute
always After flipping the phone to
mute a call, keep it always
muted while it's still facing
down when there are other
incoming calls.
44 Your first week with your new phone