Would like to know how much I will be able to use my iPad (from Aus) in Europe if I get the AT&T data plan of 20 MB. Would use it to email (maybe including a photo or two,) facebook messaging, and looking up stuff on Internet for directions,info re times of tourist stuff. Have wifi and will be staying often where wiwf will be free. It costs $25 for the 20MB, but can anyone give me an idea if I will use that very quickly, or if I can gauge how much I have left to use ?