A locking system and method automatically lock a mobile phone in a manner that significantly reduces or eliminates unauthorized use of a mobile phone. The system includes a key lock which must have a key connected to the lock in order to move the lock from a locked condition to an unlocked condition and a power source switch that automatically de-activates the mobile phone whenever a power source of the phone is removed from the phone. The key lock must be moved into an unlocked condition in order to manually activate the phone after it has been de-activated, and the key must also be connected to the lock in order to manually de-activate the phone after the phone has been activated.

An input device lock and method for preventing unauthorized access to the computer. The device is a lock switch that selectively enables or disables the line that effectuating data flow between the input device and the computer. Any input device may be selectively disabled using the present invention including a keyboard, mouse, track ball, joy stick, light pen, or other hand-held controller for example. Depending on the computer's configuration, the data flow-effectuating line is known as the data line, input/output line, signal line, or clock line. When the flow-effectuating line is disabled by this device, no data is transmitted from the input device to the computer and therefore access to the computer is controlled. No other wires inside the cable are affected; in particular, the power and ground lines are not broken. The lock switch is the style that allows the key to be inserted or removed only when the lock switch is in the input device disabled state.