Updates to the iOS, the operating system that runs the iPhone, iPod touch, and iPad, deliver bug fixes, interface tweaks, and major new features. When a new version comes out, you'll usually want to install it right away.

The release of a major new version of the iOS for the iPhone is usually an event and widely discussed in many places, so you probably won't be surprised by its release. However, if you’re not sure whether you have the newest iPhone operating system, the process of checking—and installing the update, if one is available—is quick and easy.

Begin the upgrade process by syncing your iPhone or iPod touch with your computer, either by Wi-Fi or USB (To learn how to install an iOS update directly to your device using Wi-Fi, and without iTunes, read this article). Syncing is important because it creates a backup of all the data on your phone. You never want to start an upgrade without a good backup of your old data, just in case.

When the sync is complete, look at the top right of the iPhone management screen. You'll see what version of the iOS your device is running and, if there's a new version, a message telling you about it. Beneath that is a button labelled Update. Click it.