My ideal iPad 3G would be one with all the major carriers on one. If apple could some how have chips from AT&T, Verizon, T-Mobile, and Sprint all in one, that would be amazing! Like think about it, you could change month to month depending on where you are at if traveling, etc. Like if I'm going to be traveling in places where AT&T doesn't have 3G then I would buy a plan from Sprint or Verizon, or if like T-Mobile is cheaper and I know I'm gonna be in a good coverage area that month then I could switch the plan to them, etc. I think it would be an awesome feature and could come in handy with seeing which carrier has better coverage in your area.