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 Security
keyguard is on, enter the security code when requested.
To set the keypad to lock automatically after a preset time delay 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 automatically locks.
When the device or keypad is locked, calls may be possible to the official emergency
number programmed into your device.