I just added two iPhone 5s to my AT&T family plan, and I regret it. They use up their data allotment in about 4 days, even if they never leave the home wifi, so I insist that the cellular data is kept off and only enabled when needed. Meanwhile, the WP8 and Android devices on our plan use only a fraction of their data allotment each month. Is it possible that Apple is responsible for this problem, and should do something about their devices being such data hogs?