Device Guides
Apple iPhone 6s
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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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I can't use my mobile phone's internet connection
This troubleshooting guide will take you through a number of possible causes
to help you find a solution to your problem.
Turn on data roaming.
Possible cause 1:
Data roaming is turned off
Solution:
Find "Mobile Data"
Tap Settings.
Tap Mobile Data.
Turn data roaming on or off
Tap the indicator next to "Data Roaming" to turn the function on or off.
Return to the home screen
Tap the Home key to return to the home screen.