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4000 BCE
Writing
The invention of the first writing systems is roughly contemporary with the beginning of the Bronze Age. The first writing system is generally believed to have been invented in pre-historic Sumer and developed by the late 3000's BC into cuneiform. Egyptian hieroglyphs, and the undeciphered Proto-Elamite writing system and Indus Valley script also date to this era, though a few scholars have questioned the Indus Valley script's status as a writing system.
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Telegraph
1792 – Claude Chappe establishes the first long-distance semaphore telegraph line.
1831 – Joseph Henry proposes and builds an electric telegraph.
1836 – Samuel Morse develops the Morse code.
1843 – Samuel Morse builds the first long distance electric telegraph line.
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Telephone
1947 – Douglas H. Ring and W. Rae Young of Bell Labs propose a cell-based approach which led to "cellular phones."
1981 – Nordic Mobile Telephone, the world's first automatic mobile phone is put into operation
1991 – GSM is put into operation
1992 – Neil Papworth sends the first SMS (or text message).
1999 – 45% of Australians have a mobile phone.
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Computer
On 11 September 1940, George Stibitz transmitted problems for his Complex Number Calculator in New York using a teletype, and received the computed results back at Dartmouth College in New Hampshire.[34] This configuration of a centralized computer (mainframe) with remote dumb terminals remained popular well into the 1970s.
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