How do I see / find what version of iOS my iPhone is running?
There are a number of reasons why you'll need to know what version of Apple's iOS your iPhone is currently running. Finding out is as easy as:
1) Open the Settings app
2) Tap 'General'
3) Tap 'About'
4) Scroll down and look for 'Version'
The value specified in 'Version' tells you what version of iOS you're currently operating.