SK Telecom, South Korea's leading mobile carrier, expanded its market share from 42.6% to 54.5% in 2003, according to figures from the Korea Information Strategy Development Institute (KISDI). A report from The Korea Times states that SK Telecom continues to hold a greater than 50% market share despinte efforts from the Korean government to dilute its market dominance, including a restriction that only SK Telecom users were allowed to switch their carriers without having to change their numbers during the first six months of 2004. The duopoly...