North Korea has increased its public executions against cell phone users and those who circulate outside information in the communist country, a South Korean government think tank said Thursday. The phenomenon of executions of those who "circulate South Korean leaflets and sell videos and use cell phones are on the rise," the South's government-affiliated Korea Institute for National Unification think tank said in a white paper on the North's human rights conditions. No exact figures were given. North Koreans are officially banned from communicating with the outside world but some of them listen to foreign news and use cell phones through Chinese communication networks, according to North Korean defectors in South Korea. The use of cell phones in North Korea is banned though some are smuggled into the North by Chinese who have links with South Koreans.