I wouldn't be surprised if they didn't have internet but I know little of North Korea. They definitely didn't have smartphones as this was the early 2000s.
Kwangmyong has been around since the latter half of the 90s, and is famously 'home grown' as a deliberate security feature.
NK also has some access to the regular internet, but it's very limited and tightly controlled. Meaning it is a luxury reserved for a few members of the upper echelons of NK society, or certain entrusted to people who need it for work (intelligence agencies and whatnot).