Uhh, well I used to play on my friends' iphone, which had 3G when we went to school by bus, then I played with a couple of friends in the library with our iPods etc.
Now I play on the iPad2 which took me 1 year to get, my iPod, my friends' idevices when we're on a roadtrip or something and on Facebook, when I am on holidays. (I dislike the Facebook client due to the numerous bugs)