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 of SK Telecom and KTF, a wireless affiliate of predominant fixed-line firm KT, accounts from an estimated 85% of the overall mobile market in Korea.http://times.hankooki.com/