With the iPad 3G + Wifi release date being tomorrow to get the 3G iPad in stores (if you’re having your iPad 3G ship from Apple, and you got in on the early iPad 3G ship date, your 3G iPad should arrive tomorrow too), questions are heating up about two things: the battery life for the iPad 3G (being called by some the AT&T iPad), and how does the AT&T service for the iPad 3G really work. Here, straight from the horse’s mouth, is how the AT&T service will work with the 3G iPad.