The 'trunk' telephone network is expanded and in 1906 a wireless telegraph line is opened in Lofoten. In 1919, the Norwegian Telegraph Administration acquires its first radio telephony sets . The first automatic telephone exchange is put into operation.
Automatic telephony is introduced for the first time in Oslo.
A station for regular radio broadcasts is opened and a transmitter network is developed. Telex service is introduced. One year later, the development of direct subscriber trunk dialling is started. The Norwegian Telegraph Administration begins developing a transmitter network for television. This manual VHF mobile telephone service was closed down in 1990.