its extremely hard to go over your 5gigs if your really concerned about your usage you can download the app "3g watchdog" which tracks your data, after a few days of watching that youll understand how very little amount of data you use, i tried a calculation and i cant say its absolutely correct but basing off of the 3g watchdog i was able to listen to approximately 10 hours of pandora radio a day for 30 days straight and not go over, so regardless youll be fine