16 July 1920: World 's first radiotelephone service commences public service between Los Angeles, Calif. and Santa Catalina Island. 11 April 1921: Opening of deep sea cable from Key West, Fla., to Havana, Cuba (115 miles). 22 December 1923: Opening of second transcontinental telephone line via a southern route. 7 March 1926: First transatlantic telephone call, from London to New York. 7 January 1927: Transatlantic telephone service inaugurated for commercial service (3500 miles). 17 January 1927: Opening of third transcontinental telephone line via a northern route. 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. 8 December 1929: Opening of commercial ship - to - shore telephone service. 3 April 1930: Opening of transoceanic telephone service to Argentina, Chile, and Uruguay and subsequently to all other South American countries. 25 April 1935: First telephone call around the world by wire and radio. 1937: The Western Electric type 302 telephone becomes available for service in the United States. 8 December 1937: Opening of fourth transcontinental telephone line. 1941: Multi-frequency dialing introduced for operators in Baltimore, Maryland 1942: Telephone production is halted at Western Electric until 1945 for civilian distribution due to the retooling of factories for military equipment during WWII. 1946: National Numbering Plan (area codes) 1946: first commercial mobile phone call 1946: Bell Labs develops the germanium point - contact transistor 1947: December, W. Rae Young and Douglas H. Ring, Bell Labs engineers, proposed hexagonal cells for provisioning of mobile telephone service. 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. 1950: The Western Electric Type 500 telephone becomes available in the United States after announcement in 1949. 30 June 1948: First public demonstration of the transistor by Bell Telephone Laboratories. 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 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 1958: Modems used for direct connection via voice phone lines 1960: Bell Labs conducts extensive field trial of an electronic central office in Morris, Illinois, known at the Morris System. 1960 's: Bell Labs developed the electronics for cellular phones 1961: Initiation of Touch - Tone service trials 1962: T - 1 service in Skokie, Illinois 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. 1965 (May 31): The world 's first electronic switching system commences commercial service in Succasunna, New Jersey in form of the 1ESS. 1965: first geosynchronous communications satellite - 240 circuits or one TV signal
where was the first transatlantic phone call made
from London to New York