It works on wifi, but I don’t always have wifi available. I have T-Mobile unlimited data with max. signal strength. This is the only app and game, which I can’t update through mobile network.
The errors I’m constantly getting:
No internet connection available. Please check your internet connection. - As I said, I have 4G with maximum signal strength.
Storage full. - I have 70GB-s of free storage. It should be enough for a mobile card game.