Those found guilty of using chines phones will be punished for treason in order to fend off defections and internal information leaks to the outside world, media reported on Friday.
"Kim Jong-un recently issued an order to treat people using Chinese cell phones like betrayers who conspire with South Koreans," the Daily NK quoted its source in North Korea as saying.
The North issued a similar order to thoroughly crack down on the use of Chinese cell phones in January 2014.
Earlier this month a blanket ban was put into force on weddings and funerals ahead of first Workers' Party congress organised after a gap of 36 years in the country. Kim-Jong-Un was crowned as the supreme leader at the rare event.