PTT Schweizerischen Post-, Telefon- und Telegrafenbetriebe (PTT)- Swiss Post, Telegraph & Telephone Administration)

In the 1920s, the PTT (Swiss Post, Telegraph and Telephone Administration) is founded. The automatic black desk telephone Model 29 is introduced in Switzerland and remains a classic for decades. In the 1930s, automatic telephone dialling began, and from 1940 even direct calls between Switzerland and America. In 1954, around half a million Swiss have a telephone connection and five telephone directories are published, arranged by network. In 1959, the Swiss telephone network becomes the first fully automatic network in the world. In 1978, the first national car telephone network, "Natel A", is put into operation. into operation. Further car telephone networks follow in 1983 and 1987. In 1985, around 3 million Swiss households have a fixed-network connection. 10 years later already 4 million households and already 1 million mobile telephones. At the turn of the millennium, 4 million mobile telephones are already registered and fixed-network connections are disappearing more and more, so that in 2023 there are more mobile than fixed-network connections.