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The First Transatlantic Telephone Cable is Operational (1955 – September 25, 1956)


On September 25, 1956 the first transatlantic telephone cable, TAT-1, became operational, carrying 36 telephone channels. It was laid between Gallanach Bay, near Oban, Scotland and Clarenville, Newfoundland between 1955 and 1956. 

Prior to this development, since 1927, very expensive radio-based transatlantic telephone service was available. However, radio-based transatlantic telephone service carried only around 2000 calls per year.