Disconnect the iPhone international roaming?

I will be visiting China soon. I want to have my iPhone to listen to the lessons of Chinese I have downloaded it but do not use the phone, due to the high cost of roaming when the iPhone tries to connect to the data network. I have read that the new version 1.1.1.1 of the software for the iPhone allows you turn off the vibration data and loads to take you along the sea. That is true. I have been unable to find the definition. I know that the configuration is somewhere, but how do I get to it and more importantly what is called. I do not want to wait until I get and end up with a phone bill from $ 8000 to discover I flipped the wrong setting!

1.1.1 has a "preference" to transform it. http://gizmodo.com/gadgets/apple/iphone-firmware-111-out-and-tested-breaks-3rd+party-apps-relocks-iphones-and-sends-them-to-semi+brick activation-Limbo-updated-with-video-304497.php means that it is buried in settings. iPhone jailbreaked 1.0.2 has an application called "services"

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