unlock your iPhone, press “Settings”, then click on “General”
then click “Information”
Scroll down to the Version (in this example, iOS 5.1.1 Build 9B206).
Go to your Settings. Click “About phone/device”.
Click on Software info.
Your smartphone’s information is displayed. You now have access to the installed Android version.
The Settings can easily be accessed via the pull down menu from the top of the phone or the “All apps” button on the home screen
Next find the “System” option from the list displayed and tap it.
Then choose the “About” option and tap it.
This will then display the information about the phone. The Software version can be found under the “Device information” (In the example – Windows 10 Mobile)