Device Guides
Apple iPhone 5s
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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 mobile data on my mobile phone on or off
If you want to avoid using data, you need to deactivate mobile data 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 "Cellular Data" to turn the function on or off.
Tap the Home key to return to the home screen.