Want to know which version of iPhone/iPod Touch OS you are using? No problem, all it takes is a few seconds. Follow the steps given below to find the version of OS installed on your iPhone or iPod touch.
Step 1: Click on the home button on your iPhone and go to settings. In the settings screen, click on General.
Step 2: At the top of the general screen click on About. Scroll down a bit and you will see your current OS version.