So ive answered a question lots of people are concerned with. If you dont have an unlimited plan on your phone but you still wanna play PL the answer is you can but at the cost of roughly 9.4MB per hour of 30 min farming and 30 minute pvp plus a bit of time in town. So i hope it answers all your questions. I used the app Traffic Statistics to record these results over my home wifi connection which should be very similar to what you pick up on a 3.5G network.