Handheld mobile digital electronic devices for the sending and receiving of telephone calls, electronic mail, and other digital data, for use as a digital format audio player, and for use as a handheld computer, personal digital assistant, electronic organizer, electronic notepad, and camera; handheld mobile digital electronic devices for the sending and receiving of electronic mail, and other digital data, and use as a digital format audio player, and for use as a handheld computer, personal digital assistant, electronic organizer, electronic notepad, and camera; handheld mobile digital electronic devices for the sending and receiving of electronic mail and other digital data, for use as a digital format audio player, and for use as a handheld computer, personal digital assistant, electronic organizer, electronic notepad, and camera