Holy cow! Dweller is back online again! I remember some time ago this not being the case, so pick it up while you still can.
Dweller is a roguelike game for mobile phones. If you're after a surprisingly addictive game to tide you over on the train on the way to work, this just might be the thing for you. Sure beats wasting time on card games. I've played it myself quite a while ago, and it's surprisingly easy to control, and the levels show lots of variation. Highly recommended.