<Li> 1919: The first rotary dial telephones in the Bell System installed in Norfolk, Virginia . Telephones that lacked dials and touch - tone pads were no longer made by the Bell System after 1978 . </Li> <Li> 1919: AT&T conducts more than 4,000 measurements of people's heads to gauge the best dimensions of standard headsets so that callers' lips would be near the microphone when holding handsets up to their ears . </Li> <Ul> <Li> 16 July 1920: World's first radiotelephone service commences public service between Los Angeles, Calif. and Santa Catalina Island . </Li> <Li> 11 April 1921: Opening of deep sea cable from Key West, Fla., to Havana, Cuba (115 miles). </Li> <Li> 22 December 1923: Opening of second transcontinental telephone line via a southern route . </Li> <Li> 7 March 1926: First transatlantic telephone call, from London to New York . </Li> <Li> 7 January 1927: Transatlantic telephone service inaugurated for commercial service (3500 miles). </Li> <Li> 17 January 1927: Opening of third transcontinental telephone line via a northern route . </Li> <Li> 7 April 1927: world's first videophone call via an electro - mechanical AT&T unit, from Washington, D.C. to New York City, by then - Commerce Secretary Herbert Hoover . </Li> <Li> 8 December 1929: Opening of commercial ship - to - shore telephone service . </Li> <Li> 3 April 1930: Opening of transoceanic telephone service to Argentina, Chile, and Uruguay and subsequently to all other South American countries . </Li> <Li> 25 April 1935: First telephone call around the world by wire and radio . </Li> <Li> 1937: The Western Electric type 302 telephone becomes available for service in the United States . </Li> <Li> 8 December 1937: Opening of fourth transcontinental telephone line . </Li> <Li> 1941: Multi-frequency dialing introduced for operators in Baltimore, Maryland </Li> <Li> 1942: Telephone production is halted at Western Electric until 1945 for civilian distribution due to the retooling of factories for military equipment during WWII . </Li> <Li> 1946: National Numbering Plan (area codes) </Li> <Li> 1946: first commercial mobile phone call </Li> <Li> 1946: Bell Labs develops the germanium point - contact transistor </Li> <Li> 1947: December, W. Rae Young and Douglas H. Ring, Bell Labs engineers, proposed hexagonal cells for provisioning of mobile telephone service . </Li> <Li> 1948: Phil Porter, a Bell Labs engineer, proposed that cell towers be at the corners of the hexagons rather than the centers and have directional antennas pointing in 3 directions . </Li> <Li> 1950: The Western Electric Type 500 telephone becomes available in the United States after announcement in 1949 . </Li> <Li> 30 June 1948: First public demonstration of the transistor by Bell Telephone Laboratories . </Li> <Li> 10 November 1951: Direct Distance Dialing (DDD) first offered on trial basis at Englewood, New Jersey, to 11 selected major cities across the United States; this service grew rapidly across major cities during the 1950s </Li> <Li> 1955: the laying of trans - Atlantic cable TAT - 1 began - 36 circuits, later increased to 48 by reducing the bandwidth from 4 kHz to 3 kHz </Li> <Li> 1958: Modems used for direct connection via voice phone lines </Li> <Li> 1960: Bell Labs conducts extensive field trial of an electronic central office in Morris, Illinois, known at the Morris System . </Li> <Li> 1960's: Bell Labs developed the electronics for cellular phones </Li> <Li> 1961: Initiation of Touch - Tone service trials </Li> <Li> 1962: T - 1 service in Skokie, Illinois </Li> <Li> 1963, November 18: AT&T commences the first subscriber Touch - Tone service in the towns of Carnegie and Greensburg, Pennsylvania, using push - button telephones that replaced rotary dial instruments . </Li> <Li> 1965 (May 31): The world's first electronic switching system commences commercial service in Succasunna, New Jersey in form of the 1ESS . </Li> <Li> 1965: first geosynchronous communications satellite - 240 circuits or one TV signal </Li> </Ul> <Li> 16 July 1920: World's first radiotelephone service commences public service between Los Angeles, Calif. and Santa Catalina Island . </Li>

Where was the first transatlantic phone call made