1915: The first “official” coast-to-coast call is made between A.G. Bell in New York to Thomas Watson in San Francisco
1927 Transatlantic telephone service inaugurated for commercial service (US to Britain), using radio telephony
1929: Herbert Hoover becomes the first president of the United States with a phone on his desk. Until this time, the president talked on a phone from a booth outside his executive office
1946: 250,000 women employed as switchboard operators for public service and businesses