I'm going to Europe this summer for 2 weeks, and have an iPhone. It'd be great to be able to use some Google Maps while I'm over there, but from what I understand it can cost me an arm and a leg. I'm currently on a family voice plan, and the standard $20/month iPhone data plan. I talked to the AT&T store today, and they said I could get a $25/month plan for just one month to get 20mb of data internationally. Is this a good plan? From what I've read on the internet about using the iPhone internationally, it can't possibly be just $25.