Just an observation... Up until now, cellular data usage as reported by my iPhone always read higher than that reported by AT&T. Sometimes the difference was 20-30%! I reset the meter in iOS at the start of this billing period, and for the first time ever, the numbers actually match perfectly; 2475MB reported by AT&T, 2.4GB reported in the iPhone. Maybe iOS 7 tweaked things? Hopefully the phone used to overreport, and AT&T didn't just start overreporting! Either way, it's nice to have consistency so I can tell exactly how much data I've used.