A method includes making a device capable of administering an electrical shock to a patient and operable with a smartphone. The steps include providing a case; providing an automated external defibrillator fitting within the case; providing a case input/output port to the automated external defibrillator that mates with a corresponding smartphone input/output port; and providing foldable pads fitting within the case. Each foldable pad has electrodes that are electrically connectable to the automated external defibrillator. Each foldable pad is unfolded to expose a surface of each electrode to be placed in contact with the skin of the patient. Additional steps may include providing on non-volatile memory a combined operating system for both a smartphone and the automated external defibrillator such that the combined operating system auto loads upon starting the device after connection of the smartphone to the case input/output port.