Google ANDROID 2.3.4 - Manual (Page 90)

Placing and receiving calls 90
AUG-2.3.4-105 Android User’s Guide
Options during a call
When a call is in progress, you can put a call on hold, create a phone conference, mute
your microphone, and more. See “Managing multiple calls” on page 92.
Place a call on hold
S Touch the Hold icon .
The current call screen indicates that you have a call on hold.
A Hold icon appears in the Status bar to remind you that you have a call on
hold. From any other application, you can open the Notifications panel and touch
the entry for the call on hold to return to the current call screen.
Take the call off hold by touching the Unhold button.
Mute the microphone during a call
S Touch Mute.
The Mute button lights up green to indicate that the microphone is muted.
The Mute icon appears in the Status bar to remind you that the microphone is
turned off.
When viewing the current call screen, you can unmute the microphone by
touching the Mute icon again.
The microphone is unmuted automatically when the current call ends.