Nokia 2330 - Manual (Page 19)

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 on, enter the security
code when requested.
To set the keypad to lock automatically after a preset time
when the phone is in the standby mode, 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 the 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.
Functions without a SIM card
Some functions of your phone may be used without
inserting a SIM card, such as Organizer functions and
games. Some functions appear dimmed in the menus and
cannot be used.
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