HTC One M9 User Manual page 174

174 Phone calls
Receiving calls
When you receive a phone call from a contact, the Incoming call screen appears.
HTC One M9 will automatically adjust the ringtone volume when you use the
polite ringer and pocket mode features.
Answering or rejecting a call
Do one of the following:
Tap Answer or Decline.
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If you've set up a lock screen, drag
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Muting the ringing sound without rejecting the call
Do one of the following:
Press the VOLUME DOWN or VOLUME UP button.
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Press the POWER button.
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Place HTC One M9 face down on a level surface.
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If Flip to mute option in Sound & notification settings is set to Mute once,
HTC One M9 will still ring when there are subsequent incoming calls.
What can I do during a call
When a call is in progress, use the buttons onscreen to mute or unmute the
microphone or to turn the speakerphone on or off.
or upwards.