LG MM-535 Owner's Manual page 43

There may be times when you need to silence your phone entirely.
The phone's Silence All option allows you to mute all sounds without
turning your phone off.
Press and hold the volume key down in standby mode.
(The screen will display "Silence All.")
Press the volume key up repeatedly to select a desired
volume level.
The text greeting can be up to sixteen characters and is displayed on
your phone's screen in standby mode. You may choose to display a
custom greeting or you may display your Sprint PCS User Name on
the phone's screen.
Press
Select
Select
Select
Select
Press
Use the numeric keypad to enter a new custom greeting.
Press
(left softkey ) to access the main menu.
( ).
( ).
( ).
using the navigation key and press
to clear the existing greeting.
to and exit.
.