I won't over complicate the question: Basically, what I'd like to know is, can you tether the internet (ie. unlimited data from iPhone) to other Apple devices? For example: Could I tether my iPhone's internet to my Macbook Pro when I'm in public (where there is no wi-fi)? Could I tether my iPhone's internet to my iPad when I'm on a train in public (where there is no wi-fi)? Are there tariffs to allowance of tethering? Do certain carriers allow tethering? If so, which ones? Do they charge for a tethering service? I'm not sure if we're allowed to discuss jail breaking on these forums (I'm relatively new), but is it possible to jailbreak your device to allow tethering? Does tethering have any sort of significant impact on the device's battery life? All answers and insights would be greatly appreciated. Thanks.