Who has figured out the cheapest/smartest way to use the iPhone with Skype in the United States? Does anyone in the US use the iPhone with only Skype (no carrier bill), and pay for some service/device to stay connected away from home/office? I have Skype Global Unlimited and an unlocked iPhone 4... so I pay Skype every month for unlimited usage. If you think you've got it all figured out, pls post details and cost. Thanks!