There are some. Civilization Revolution is available for iOS and Windows Phone. I'm not sure why they never did an Android version. I played the Windows Phone

There are some. Civilization Revolution is available for iOS and Windows Phone. I'm not sure why they never did an Android version. I played the Windows Phone version back when it was released. It was fairly decent. I'm not a civ aficionado though, so I don't know how well it stands up when compared to other editions. The thing is though, if I'm going to play a decent game that takes time and thought, I sit down at my laptop or console. It's not really what I want from a phone. I want a game that I can play for 2 minutes while I wait for something else. It's not that I'm not prepared to spend £+ for a decent mobile game, it's that when I want to buy a decent complex game, I tend to choose a different platform to buy the game on.