The North Korean government seems to be phone calls to the border with China to disrupt. The aim of the authorities of the communist country would probably be the flow of information to abroad for better check.
Several Chinese report that they are not more to a North Korean phone number to call. In addition, there are reports made of the expansion of the telephone services in border areas with China, which the North Korean government probably wants to prevent that the foreign country to know what is currently in the communist country is playing.
Recently died dictator Kim Jong-Il and it is likely that his son, Kim Jong-Un, his role will take over. The country seems to be unrest during the transition to want to prevent the flow of information from and to foreign countries to check. Furthermore, would the North Korean government markets in certain areas have closed and checks the army is stricter in the border areas.