HTC One M8 for Windows - Manual (Page 104)

Receiving calls
When you receive a phone call, the Incoming call screen appears.
Answering a call
§ Tap answer.
§ Or if the display is off and wakes up when you get a call, swipe up
from the bottom to unlock the screen first and then tap answer.
Rejecting a call
§ Tap ignore.
§ Or if the display is off and wakes up when you get a call, swipe up
from the bottom to unlock the screen first and then tap ignore.
Muting the ringing sound without rejecting the call
Do one of the following:
§ Place your phone face down on a level surface.
If your phone is already facing down, it will still ring when there are
subsequent incoming calls.
§ Press the VOLUME UP or VOLUME DOWN button.
§ Press the POWER button to silence the ringer and turn the display
off.
104 Phone calls