Can Koreans open a mobile phone shop in North China? What are the procedures?

You can't. North Korea is a country that prohibits the use of mobile phones. The situation in North Korea is like this. When North Koreans buy TV or radio, they must send it to the relevant departments and change the TV and radio channels to only the official channels of North Korea. Otherwise, it is illegal. It is forbidden to use computers and mobile phones. And there is no base station in North Korea. There is a mobile phone, no operator, just no signal. But on the border between China and northern China, North Koreans and South Korean businessmen will use mobile phones. With the help of China Mobile and China Unicom Dandong Base Station, it was secretly used. But it is actually illegal. Foreign tourists are not allowed to bring mobile phones into North Korea. Therefore, selling mobile phones in North Korea is as close to death as selling drugs in the Mainland.