Why would the cellular system have to contact China? Is China spying? Very strange. But thanks for the info. Maybe I'll contact DJI support. They say they're happy when I ask them questions!It has something to do with how the cellular network allows or disallows the system to call home to China, i believe. I dont think it works on all of our networks. Ill try and purchase a couple of dongles in the new year and do some testing