So I had the 4s until last October and upgraded to the 5c. Since then, I have watched my data usage skyrocket and I am now up to 15gb of data for my single line. I have called Verizion several times to question it, and they finally did an analysis on the line only to tell me some mystery thing is running six hours a day. I have wi-fi at home, school and work. I started turning off the cellular data when I was on wifi just to see what would happen and within five minutes of turning the cellular data back on, while still on wi-f the usage goes up. Now if Im on wi-fi my cellular data sholdnt be moving at all. This is an issue that VEriszion needs to deal with and I will be contacting them today, because they need to explain why their network is charging me for usage when connected to a wifi network. I have all but turned off every feature on the phone and the data usage continues to rise. Sprints service is nowhere near as good, but I will switch if it means saving 120+ a month in charges.