Is it safe to bring my mobile phone into North Korea?

Upon arrival at the airport you have to hand in your mobile phone. All mobile phones will be sealed in a package and kept until you leave the country. If you leave by train, you will receive the package from your guide on the day of departure. It will be stored in a sealed package. You are allowed to break the seal and use your mobile phone only after you cross the border. If you open the seal before you reach the border, then you will be sent back to the capital for ‘administrative purposes’. Your phone will be resealed after which you can take the train again.