HTC Desire Z User Guide - Page 45

45 Phone calls Muting the ringing sound without rejecting the call Do one of the following:  Press the VOLUME DOWN or VOLUME UP button.  Press the POWER button.  Place the phone face down on a leveled surface. If the phone is already facing down, the phone will still ring when there are subsequent incoming calls. HTC Caller ID Everytime you make a call or your friend gives you a ring, you get to see your friend's latest status update from social networks like Facebook or Twitter right on the call screen. You also won't miss people's birthdays. You'll see a birthday reminder, if your friend's birthday will occur sometime within the next seven days. Using in-call options When a call is in progress, use the buttons onscreen to mute or unmute the microphone or to turn on or off the speakerphone. You can also press MENU and choose whether to add a call, place the call on hold, mute the microphone, and more. Putting a call on hold Press MENU and then tap Hold to put the call on hold. When you put a call on hold, the status bar displays the Hold call icon ( ) and its color changes to pulsing red. Press MENU, and then tap Unhold to resume the call.