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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My mobile phone is slow
This troubleshooting guide will take you through a number of possible causes
to help you find a solution to your problem.
End running applications.
Possible cause 1:
There are too many running applications
Solution:
End running applications
Tap the Home key twice.
Slide upwards on the required application to end it.
Return to the home screen
Tap the Home key to return to the home screen.