Samsung SCH-I839, User Manual, Page: 55 / 187

Call functions
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Quickly switching to Silent mode
Silent mode disables all sounds on your phone except for
camera, media player and other applications. This feature
is best used in situations where the phone might disturb
others, such as in a meeting, at a library, or in a theatre.
To enter Silent mode, press and hold on the Phone
screen until Entering Silent Mode displays. The Silent
mode icon ( ) appears at the top of the screen.
To exit and reactivate the previous sound settings, press
and hold
until Exit Silent Mode displays.
Options during a call
Your phone provides a number of functions that you can
use during a call.
Muting the microphone
You can mute the microphone so that the other person on
the phone cannot hear anything you say, but you can still
hear the person.
To mute the microphone, tap Menu
→
Sound
→
Mute On .
To unmute, tap Menu
→
Sound
→
Mute Off .
Muting key tones
You can mute the keypad to press the keys without hearing
annoying key tones.
To mute keytones, tap . To unmute, tap the icon again.