Device Guides
Apple iPhone 4S
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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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Search in Apple iPhone 4S
How to
Checking the software version for my mobile phone
You can check the software version for your mobile phone. If you don't have the newest software version, you can update your mobile phone's software.
Tap Settings.
Tap General.
Tap About.
Your mobile phone's software version is displayed next to Version.
Tap the Home key to return to the home screen.