of the market. In terms of technology, KT primarily uses Digital Subscriber Line (DSL). Hanaro uses a mix of cable and DSL. Thrunet service is mainly provided through cable modem. At end of June 2011, subscribers of Voice over Internet Protocol (VoIP) service achieve 10.1 million or around 20 percent of South Korea's population. This article relied on information from: Yun, Kyounglim, Heejin Lee and So-Hye Lim, The Growth of Broadband Internet Connections in South Korea: Contributing Factors, Asia/Pacific Research Center, Stanford University (September 2002). Choudrie, Jyoti and Heejin Lee, Broadband Development in South Korea: Institutional and Cultural Factors, European Journal of Information Systems v. 13, pp. 103–14 (2004). See also Korean telephone numbering plan List of South Korean broadcasting networks Ministry of Information and Communication References