Telecommunication
The conventional telephone was invented independently by Alexander Bell and Elisha Gray in 1876. Antonio Meucci invented the first device that allowed the electrical transmission of voice over a line in 1849. However Meucci's device was of little practical value because it relied upon the electrophonic effect and thus required users to place the receiver in their mouth to "hear" what was being said. The first commercial telephone services were set-up in 1878 and 1879 on both sides of the Atlantic in the cities of New Haven and London.
Thomas A. Watson
Thomas A Augustus Watson (January 18, 1854 – December 13, 1934) was an assistant to Alexander Graham Bell, notably in the invention of the telephone in 1876. He is best known because, as the recipient of the first telephone call – although coming from just the next room – his name became the first words ever said over the phone. "Mr. Watson – Come here – I want to see you," 
Bell said when first using the new invention, according to Bell's laboratory notebook. There is some dispute about the actual words used, as Thomas Watson, in his own voice, remembered it as "Mr. Watson – Come here – I want you," in a film made for Bell Labs in 1931 which is referenced below in "The Engines of our Ingenuity."