Samsung SGH-D415MSATMB - Manual (Page 28)

Getting Started
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The phone searches for your network and, after finding it, the idle
screen appears on the display. Now, you can make or receive a call.
4. When you wish to switch the phone off, push the slider up and
press and hold the key until the power-off image displays.
Using the Keypad Lock Feature
You can push the slider up to use the number keypad and down
to make the phone compact.
When you push the slider down, the display turns off and the
phone automatically locks the keypad to keep it from being
pressed accidentally.
When you press and hold down the
key or one of the
Volume keys on the left side, the display turns on and shows
“Keypad Locked.” To unlock the keypad, press and hold the
Unlock soft key. The keypad is activated and you can use the
phone’s functions.