While I don't have a smart phone and so don't play mobile games, I really don't see the idea as being feasible. There are just too many limitations for that type of device. The game would need to be scaled back so much that it wouldn't even resemble the original anymore. So why bother even trying? Not everything needs to be cross-platform. These games, and I include GalCiv 2, were meant to be played on a PC and that is where they should stay. By having them on a PC platform, you can add so much more complexity to them that you couldn't possibly recreate the same features on something like a smart phone. They'd end up being so simplified that they wouldn't even be worth playing anymore.
BTW, how's everyone liking the game so far? I pop in from time time to see how things are going, waiting for the final release, and it's been awhile since I've been here. I'm not really interested in a beta version myself, I'd rather wait until it's all polished up. And I'm very much looking forward to that day.