So I'm planning a trip to the UK, France and Portugal in November. I'm pretty well versed in the workings of the iPhone and currently have a jailbroken 3GS 32GB. I can unlock it if necessary to use for any SIM card. My questions are directed towards anyone who has traveled to Europe with an iPhone. I plan on using it primarily for data (GPS, etc). What's the best way to use it for data, without racking up a huge bill? I looked on AT&T's website and their plans seem like crap. Any advice?