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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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.
Restart your mobile phone.
Possible cause 2:
There's an error in the operating system on your mobile phone
Solution:
Restart your mobile phone
Tap and hold the Home key.
At the same time, tap and hold On/Off until your mobile phone is restarted.