HTC Tilt 2 NMRHOD00 User Manual page 57

To swap between a
private call and the
conference call, tap
the dim area that
shows "On Hold" or
tap Menu > Swap.
To turn on the speakerphone during a conference call
While a call or conference call is in progress, you can turn on the
speakerphone by simply placing your device face down.
Your device provides crystal-clear
sound quality and voice reception
during conference calls. When the
speakerphone is on, your device
also enables the dual microphone
to enhance your voice quality and
reduce noise.
When you need to temporarily
mute the dual microphone so that
the conference call participants
will not hear you, press the MUTE
button. Press it again to unmute.
To end the conference call
Tap End Call or press END.
Chapter 2 Phone Calls 
Dual speaker
MUTE
Dual microphone