North Korea has a one internet provider (Star Joint Venture Co.) which directly linked from China to North Korea.
And Koryolink is their mobile carrier in North Korea.
Although , North Korean users won't able to use 3G Internet Connection , only allowed is to use Phone Calls and SMS Messages. Only tourist can be able to access 3G Internet Access From Koryolink. You cannot access Facebook , Twitter , Instagram and ÿôutubê due to security and not allowing to take a photo or video inside in North Korea.
In the DMZ , South Korean Soldiers blasting a sound of K-POP songs between North Korean DMZ. Blasting a K-POP Music is implemented to listen to it's new generation of music of South Korean compared to the stucked 1980's song.
North Korea has a one TV Provider only (KCTV) it's opens between 3:00PM and Closes around 10:00PM (Pyongyang Time GMT +8:30).
North Korea has not allowed to open lights further more. You cannot run a multiple open lights on your house , because Power Supply in North Korea is limited. So during the night Whole North Korean Country totally pitched black due to on it's limitation between Power Supply Generators.
(NOTE : Eto lang ng alam ko sa North Korea , and this my own english. Not copy pasted.)