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'Radiolinja' was a Finnish GSM operator founded on September 19 1988. On March 27, 1991, the world's first GSM phone call was made in Radiolinja's network. The network was opened for commercial use on July 1, 1991.
Radiolinja's original investors included a broad scale of Finnish corporations and local telephone companies. In the mid 90's Elisa (back then known as HPY, or Helsinki Telephone Co-operation) started acquiring more and more of Radiolinja's stock which ultimately lead to merger of Radiolinja, Radiolinja Origo and Elisa. At this point Elisa had also acquired some other major stake holders of Radiolinja such as Soon Communications (earlier Tampere Telephone Plc and even earlier Tampere Telephone Co-operation).