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Was a point-to-point text messaging system, used from the 1840s until better systems became widespread.
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Is a telecommunications device that permits two or more users to conduct a conversation when they are too far apart to be heard directly.
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Sometimes shortened to tele or telly, is a telecommunication medium used for transmitting moving images in monochrome , or in color, and in two or three dimensions and sound.
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Is the technology of signaling and communicating using radio waves.
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Is a machine that can be instructed to carry out sequences of arithmetic or logical operations automatically via computer programming.
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Is a mobile device, typically with a mobile operating system and touchscreen display processing circuitry, and a rechargeable battery in a single, thin and flat package.
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Is a portable telephone that can make and receive calls over a radio frequency link while the user is moving within a telephone service area.
