 The first telephone service in Norway was offered in 1878 between Arendal and Tvedestrand, while the first international telephone service between Christiania and Stockholm was offered in 1893.Automation of the telephone system was started in 1920 and completed in 1985.In 1946 the first Telex service was offered, and in 1976 satellite telephone connections to the Norwegian merchant navy, at the time the largest in the world and to oil platforms in the North Sea were made operational.