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.