Scientific and technological development in the South Korea at first did not occur largely because of more pressing matters such as the division of Korea and the Korean War that occurred right after its independence. It was not until the 1960s under the dictatorship of Park Chung-hee where South Korea's economy rapidly grew from industrialisation and the Chaebol corporations such as Samsung and LG. Ever since the industrialization of South Korea's economy, South Korea has placed its focus on technology-based corporations, which has been supported by infrastructure developments by the government. South Korean corporations Samsung and LG were ranked first and third largest mobile phone companies in the world in the first quarter of 2012, respectively. An estimated 90% of South Koreans own a mobile phone. Aside from placing/receiving calls and text messaging, mobile phones in the country are widely used for watching Digital Multimedia Broadcasting (DMB) or viewing websites. Over one million DMB phones have been sold and the three major wireless communications providers SK Telecom, KT, and LG U+ provide coverage in all major cities and other areas. South Korea has the fastest Internet download speeds in the world, with an average download speed of 25.3 Mbit/s.