Elisa Oyj (Elisa) is a Finnish telecommunications company founded in 1882 (known until July 2000 as HPY or Helsingin puhelinyhdistys). Elisa Oyj employs about 3000 people. The company's revenue for 2007 was about €1.57 billion. Mobile operations of Elisa were known as Radiolinja before. Elisa works together in co-operation with Vodafone. The world's first GSM call was made in Finland with Radiolinja's GSM-network on March 27, 1991. Elisa launched world's first commercial UMTS900 network on November 8, 2007.