Total telephone subscribers in Vietnam reached over 130 million as of March 2012, with mobile subscriptions accounting for the vast majority of new subscribers over the past year. Over 90% of urban mobile users have prepaid SIM cards, with young people aged 15-24 most likely to use prepaid plans. While Mobifone has the largest market share in major cities, Viettel is the leading mobile provider across Vietnam overall. 3G connections surpassed 20 million in mid-2011, making up around 18% of total subscribers. Smartphones now account for 29% of mobile phone users in Vietnam.