Samsung SCH-3500 - Manual (Page 57)

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Keyguard.
To avoid accidental key presses, you can enable the
KeyGuard feature. However, you’ll still be able to receive
incoming calls and messages. This feature also prevents
needless battery usage because the phone does not
respond to any keypresses and turns off the backlight.
Note: If you have an incoming call, open the flip to answer
it. When you are done with the call, close the flip and
KeyGuard is automatically turned on.
To activate KeyGuard:
1. Press to display the Main Menu.
2. Press for KeyGuard. The keypad locks and
“KeyGuard” displays.
3. Press and hold to deactivate KeyGuard, or simply
open the flip to turn on the backlight and temporarily
disable KeyGuard.
Note: KeyGuard works only when the flip is closed.