I saw this few days ago and activated it, Android phone. If I will need juice I will give it a try during my trip next week and let you guys know if it works.You also seem to be able to use your phone's NFC as a virtual card. You therefore do not need internet.
I did set it up in the app, you can do that in the same place as where you can link a physical card, but I still can't activate a pole with it (I haven't tried it more than once)
Saves 16 bucks