This is simple crazy...since first iPhone on average I did use less than 2GB, ever since iPhone 5 my Data is through the roof. I have been only 17 days in the billing cycle and I have used over 5GB (its showing 4.2 but its over 5GB now). I can understand I did use little more data because just got new phone but my general usage of iPhone did not change...My Wi-Fi is always on and I dont download movies or anything like that....anyone experiencing same thing?