So, I'm vacationing to Sydney, Australia next month. I'm wondering if I'll need a voltage converter to charge my American iPhone 3G, or if I can get away with just an outlet adapter. I was able to use my U.S. MacBook without a voltage converter in the U.K., as it detects voltage and adjusts accordingly. Does the iPhone do the same thing? I plan to use it in wifi mode while I'm there to catch up with work emails, and really don't want to fry it in the process.