Thankfully, doing so is actually pretty straightforward. The easiest and quickest way to check the iOS version on your iPhone is to go to your Settings app. Then, open General and choose About. Your current iOS version should be listed at the top of the screen, under your iPhone name. You can tap on the iOS version to see what new changes the latest update introduced. You can also see what iOS version your phone running from your PC or Mac, if the iPhone has been connected to it. To find your