I have had an iPhone on AT&T since launch. I never went over a gig in any month. I have used half a gig in 2 days with Verizon!! Worse, it uses LTE while I am at home with a rock solid wifi connection. If I turn cellular off altogether I can still see, for example, a YouTube video. But if I leave it on, while still connected with wifi, it ***** data like a vampire. I don't stream video, use Itunes match, pandora, etc.
A single view of a regular web page--say, NY Times, will register as 15mb!!!
And, all day, it leaks data even with no apps running!
I spent over 4 hours on the phone with Verizon. I called today to check the status of this problem, and found that they had not even opened a ticket!!😮
They have assured me that I will not be charged for any overages, but this is a huge problem. My wife's ATT Iphone 5 has used maybe 100 mb in the same period, which would be completely consistent with our usage.
So far, nobody at Verizon has said a peep, but this is all over the place:
http://forums.macrumors.com/showthread.php?t=1456838
http://tidbits.com/article/13304
http://forums.macrumors.com/showthread.php?t=1454883&page=3
https://discussions.apple.com/thread/4373365?tstart=0