Turning data roaming on and off on my Apple iPhone 5c
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 Cellular.
3. Touch the tab next to Data Roaming to turn Data Roaming on.
4. Touch the tab next to Data Roaming to turn Data Roaming off.