Nokia 5500 - Keypad lock (keyguard)

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Your phone
To access help when an application is open, select
Options > Help. To switch between help and the
application that is open in the background, select and hold
Menu. Select Options and from the following options:
Topic list — to view a list of available topics in the
appropriate category
Help category list — to view a list of help categories
Search by keyword — to search for help topics using
keywords
To open help from the main menu, select Tools > Help. In
the list of help categories, select the desired application to
view a list of help topics. To switch between the help
category list, indicated with , and a keywords list,
indicated with , scroll left or right. Press the scroll
key to display the related help text.
Volume control
To adjust the earpiece or loudspeaker volume during a call
or when listening to an audio file, press the volume keys.
To activate the loudspeaker during a call, select Loudsp..
To deactivate the loudspeaker during a call, select
Handset.
Warning: Do not hold the device near your ear
when the loudspeaker is in use, because the
volume may be extremely loud.
Keypad lock (keyguard)
To prevent the keys from being accidentally pressed, press
the left selection key and * within 1.5 seconds to lock the
keypad.
To unlock the keypad, select Unlock, and press * within 1.5
seconds.
When the keypad lock is on, calls may be possible to the
official emergency number programmed into your device.
Flashlight
To switch the flashlight on or off, in the standby mode,
press and hold *.