We thought a bug with carrier settings that led to some iPhone 5 owners reporting burning through excessive cell data on Verizon was fixed when Apple pushed a carrier settings update and Verizon promised not to slap the iPhone 5 owners for unwarranted cellular data usage. According to the latest by big media, the problem could be worse than originally thought.
As an added "bonus", it doesn't appear to be contained to Verizon customers only as apparently customers of AT&T, Sprint and other carriers are experiencing the same cellular data overages stemming from this bug. It would seem that something about the iPhone 5 or perhaps iOS 6 is causing the same cellular data drain even when the device is connected to WiFi...