Handheld mobile digital electronic devices comprising a full featured tablet computer, electronic book reader, digital audio and video player, electronic personal organizer, personal digital assistant, electronic calendar, and global positioning system (GPS) device, and capable of providing access to the Internet and sending, receiving, and storing messages and other data; computer game and electronic game programs; parts, and fittings for handheld mobile digital electronic devices comprising a full featured tablet computer, electronic book reader, digital audio and video player, electronic personal organizer, personal digital assistant, electronic calendar, and global positioning system (GPS) device; electronic testing apparatus for testing the functionality of handheld mobile digital electronic devices comprising of a full featured tablet computer, electronic book reader, digital audio and video player, electronic personal organizer, personal digital assistant, electronic calendar, and global positioning system (GPS) device; batteries; rechargeable electric batteries; battery chargers; chargers for electric batteries; headphones; stereo headphones; in-ear headphones; stereo audio speakers; audio speakers; audio speakers for home; digital music and/or video players; radios; video cameras; audio, video, and digital sound mixers; radio transmitters; bags and cases adapted or shaped to contain tablet computer devices; bags and cases adapted or shaped to contain MP3 players, hand held computers, tablet computers, personal digital assistants, global positioning system (GPS) devices, electronic organizers and electronic notepads; USB (universal serial bus) hardware; computer stylus