One thing I am considering when taking the overnight sleeper from Pyongyang to Beijing is to have a 3G simcard available so I can surf the Internet at the very least after crossing the border. How easy is this to obtain for non Chinese residents/citizens? I have a little modem device which works as a wifi for my computer (and my usual mobile phone) where I can insert the SIM card into. I just need the data, not any phonecalls or something like that. As the train crosses over the border during the day there would be enough dead time to kill while in Chinese "railspace".