Hey folks, I'm going on a half family holiday/half business trip from Australia to the US at the end of Jan for almost a month and I'm trying to work out what to do about getting prepaid calling and data for two iPhone 4s and 3G iPads. Obviously, we don't have a US credit card, so anything that requires that is out. I'm going to need a fair amount of data on my phone (can you tether in the US? Is there free wifi everywhere that I can use on my MBP?) but 100mbs on my iPad should be fine, and the other iPhone and iPad won't need much data at all. I've tried to do some research, but it's all kinda confusing, especially with AT&T having iPhone exclusivity and me not knowing how that effects prepaid stuff. Please pardon my uber n00bishness to the US phone thing. Thanks for your help!