I just can't access the online servers with only mobile data enabled. The message always appears: "you need to connect via wi-fi to play with your friends." But the point is that even with the "use data from mobile connection" option enabled, I can't get into the server I want at all. I have already enabled and disabled the option; I already disconnected from the account, and connected again; But it was no use. I hope the game's developers will verify this situation as soon as possible.