How to turn data roaming on and off on my Apple iPhone 3GS

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You can turn data roaming on and off as needed. When abroad, we recommend that you turn off data roaming to avoid unwanted roaming charges when using email, web browsing and other data services.
1. Touch Settings.
2. Touch General.
3. Touch Cellular.
4. Touch OFF to turn Data Roaming on.
5. Touch ON to turn Data Roaming off.