Nokia X200 - Manual (Page 23)

Keypad lock
To prevent accidental keypresses, select Menu , and press
* within 3.5 seconds to lock the keypad.
To unlock the keypad, select Unlock , and press * within 1.5
seconds. If the security keyguard is activated, enter the
security code when requested.
To set the keypad to lock automatically after a defined
length of time when the device is not being used, select
Menu > Settings > Phone > Automatic keyguard >
On .
To answer a call when the keypad is locked, press the call
key. When you end or reject a call, the keypad locks
automatically.
When the device or keypad is locked, calls may be possible
to the official emergency number programmed into your
device.
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