Martyn Williams says the service could change the way foreign media report on North Korea. He says having an Internet connection on a camera-equipped mobile phone means reporters can avoid some of the official restrictions.

"It gives reporters the ability to take a picture and to send the picture immediately. And then that means that once the picture is gone, even if someone comes up and says you can't take that picture, you have to delete it. You can turn around and say 'I'm sorry, but it's already sent.' Or you can delete it, but you know that it's already gone."

David Slatter works in Seoul as a writer for the website NKNews.org. He admits that reporters may be able to publish some images without the approval of the North Korean government. But he says their effect may be limited.

"At the moment, it seems very interesting. But in a few months, I do question how much will these photos really be covered if we just have the same handful of 10-11 people inside Pyongyang tweeting about their lunch."

Gareth Johnson directs Young Pioneer Tours, which takes foreigners on trips to North Korea. He believes that these ordinary pictures could prove to be helpful.

"In my mind, one fairly positive thing that is going to happen is people are going to see it less as a freak show.

China's official Xinhua news agency says the Koryolink SIM card will cost $200. Data will cost an additional $200 for 2 gigabytes.