Device Guides
Apple iPhone 5c
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iOS is the operating system software installed on your iPhone. To find out which version you have: Tap Settings, Tap General, Tap About, and view the version number.

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How to
Turning data roaming on my mobile phone on or off
If you want to avoid using data when you're abroad, you need to turn off data roaming on your mobile phone. Once done, you can only make voice calls, send SMS and use applications that don't require an internet connection.
Tap Settings.
Tap Cellular.
Tap the indicator next to "Data Roaming" to turn the function on or off.
Tap the Home key to return to the home screen.