at the satellite communication facility in Raisting, Bavaria, Germany
Telecommunication is the transmission of signs, signals, messages, words, writings, images and sounds or information of any nature by wire, radio, optical or other electromagnetic systems.
Telecommunication occurs when the exchange of information between communication participants includes the use of technology. It is transmitted through a transmission medium, such as over physical media, for example, over electrical cable, or via electromagnetic radiation through space such as radio or light. Such transmission paths are often divided into communication channels which afford the advantages of multiplexing. Since the Latin term communicatio is considered the social process of information exchange, the term telecommunications is often used in its plural form because it involves many different technologies.
Early means of communicating over a distance included visual signals, such as beacons, smoke signals, semaphore telegraphs, signal flags and optical heliographs. Other examples of pre-modern long-distance communication included audio messages such as coded drumbeats, lung-blown horns, and loud whistles. 20th- and 21st-century technologies for long-distance communication usually involve electrical and electromagnetic technologies, such as telegraph, telephone, and teleprinter, networks, radio, microwave transmission, optical fiber, and communications satellites.
A revolution in wireless communication began in the first decade of the 20th century with the pioneering developments in radio communications by Guglielmo Marconi, who won the Nobel Prize in Physics in 1909, and other notable pioneering inventors and developers in the field of electrical and electronic telecommunications. These included Charles Wheatstone and Samuel Morse (inventors of the telegraph), Alexander Graham Bell (inventor of the telephone), Edwin Armstrong and Lee de Forest (inventors of radio), as well as Vladimir K. Zworykin, John Logie Baird and Philo Farnsworth (some of the inventors of television).
AT&T Inc. (NYSE: T) is the largest provider of both local and long distance telephone services, wireless service, and DSL Internet access in the United States. AT&T is based in San Antonio, Texas, United States. Formerly SBC Communications, Inc., the company shed its name and took on the iconic AT&T moniker and the T stock-trading symbol (for "telephone") after its acquisition of AT&T Corporation ("Ma Bell").
Since the break-up of American Telephone and Telegraph Company in 1984, most of the companies spun off from it (the "Baby Bells") have merged into three major US telecommunications groups: Verizon, Qwest, and what is now AT&T Inc. Most of these companies are made up primarily of former components of American Telephone and Telegraph Company. For the new AT&T, these include many Bell Operating Companies and the long distance division. 
Kleinfield, Sonny. The Biggest Company on Earth: A Profile of AT&T. New York: Holt, Rinehart, and Winston, 1981.
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Guglielmo Marchese Marconi, GCVO (25 April 1874-20 July 1937) was an Italian inventor, best known for his development of a practical radiotelegraph system, which served as the foundation for the establishment of numerous affiliated companies worldwide. He shared the 1909 Nobel Prize in Physics with Karl Ferdinand Braun, "in recognition of their contributions to the development of wireless telegraphy". While growing up, Marconi had an intense early interest in science, and was especially fascinated by electricity.
Did you know?
...that Intelsat 1, known as Early Bird, launched in 1965, provided either 240 voice circuits or one two-way television channel between the United States and Europe.
...that the first telephone message was transmitted in 1876 from one room in Alexander Graham Bell’s house to another.
...that in 1880 France rewarded Bell the Volta Prize, worth 50,000 francs, for his invention.