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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.