It isn't official by any means, but I know that you can play on Android through the joiplay emulator. I also know there's a newer RPGXP emulator that is supposedly a bit nicer, but I can't remember what it is called off the top of my head.
If you join the discord and head to #roles, we've got a mobile-specific channel with some pretty knowledgeable folks. I'm not one of them, unfortunately!!!