Just trying to clarify things for myself. Apple says the iPhone 4S is a world phone. Does this mean I can travel anywhere and put in a sim card from a foreign carrier (like Orange, or O2) and use it while I'm there, and then back in the USA, use the carrier I have a contract with? OR Does it mean that I get charged Roaming Fees when I'm all around the world?? (The only reason I'm asking is because this quote from apple's website is nagging at my mind) "And iPhone 4S is a world phone, so you can use it almost anywhere. Whether youre a GSM or CDMA customer, you can roam GSM networks in 200 countries around the world." Taken from: http://www.apple.com/iphone/features/ If you have any ideas about this, or a good guess or two, I would hugely appreciate it. I guess what I'm asking is did apple unlock all iPhone 4S' by default so that I can use them with any carrier worldwide, or does a 2 year contract with a US carrier mean that I have to pay those really expensive Roaming fees??