Now this is just a theory of course, but it seems to me that the much faster speed of LTE is going to cause quite a bit of problems for folks who aren't grandfathered in to the Unlimited Data plan. Coming from 3G especially, let's say you can browse, request data, interact with apps, etc, etc roughly 10 times faster than you can before the IPhone 5... Would it be safe to say, you would push at least twice the amount of data as you do now? If you can accomplish something 10 times faster, I think it's fair to say you would do more, probably not 10 times more, but easily twice as much in the same amount of time you do it now. Are you using 50% or less (or a lot less) of your monthly data cap currently? If you aren't, you're probably in trouble. It's like leasing a car and going over on miles, you know you're over, but hey, you gotta get to work, so you can't stop driving, but you're going to have an ugly bill in the end. Good Luck!