Checking what Android version a phone is running on is simple. The two easiest ways to do this are below – you’ll need the phone in your hands for both.
Open the web browser on the Android phone you’re wanting to check and open the following web page:
The website will display the phone’s Android version on screen as in the image below:
On the phone itself, tap the “Menu” button and select “System Settings”
Scroll right down to the bottom of the menu
Tap “About phone”
The “Android version” will be displayed as the numerical version (e.g. 4.0.4) and not the generic version (e.g. Ice Cream Sandwich).