At the moment, OpenMPT heavily relies on Windows-native functionality. This may change with a planned port to Qt in the far far future, but I don't think there will ever be a port to mobile devices. And there is not UNIX integration, and the bit of non-Windows code is more to make it work together with Wine (which simulates a Windows environment).
The main reason for the never-to-be mobile version: The UI is not meant to be used with a touchscreen, and there is a distinction between touch interaction and mouse interaction. Most music trackers can only be controlled with a more precise input method, like mouse for selection and drag'n'drop actions or some kind of keyboard (for example LSDJ on Game Boy), and there are also lots of keyboard shortcuts, that simply can't be mapped to touch commands. Trying to select a range of notes and/or effects, even across channels, would be a pain with a touch input.
Try to input notes, instruments and effects with parameters in a cell in a channel, with a touch input. I don't think you would want that.
For Apple devices, not only are you required to have access to a mac (its the only supported method to develop for iOS devices), but also have to pay a yearly license fee. Its a bit more relaxed for Android devices, since you're not bound to specific hardware for development, but the yearly license fee for the Play Store is not optional.