So I got my new bill today and I noticed an extra $40 charge on it so I looked into my data usage and on one day it said I had used 4.1gb of data! I still have no idea how this is possible. I don't stream video's or movies because I know how much data they use. I check a few websites a few times a day and that's it. So I called my carrier and they couldn't explain it either. They said it must have been a hiccup in the system and removed the charge.