Question for those of you with the family plan on your iPhones! How exactly does it work? Is it different from the family plan with normal phones. Right now I have an iPhone 3g and my wife has a basic cell phone added onto my plan as an extra line for $9.99. Would this stay the same if we BOTH were to get the new iPhone, and the only thing extra to pay for would be an extra $25 a month for the data plan for her phone? I'm just looking for a break down of how the iPhone family plan works, not sure if there is a combined family data plan or if you pay for each individually. Any info on this would be appreciated, AT&Ts site isn't very clear.