Over-the-air Update:
If you are on a Wi-Fi network, you can upgrade to iOS 8 right from your device itself. No need for a computer or iTunes. Go to Settings > General > Software Update and click the Download and Install button for iOS 8. After tapping the Download and Install button, you'll need to tap to agree to Apple's terms and conditions and then wait as your phone downloads the file.

Via iTunes:
If you are near your computer with iTunes, it might be faster to update this way. You may first need update iTunes to version 11.4. Finally, open iTunes and then click iTunes > Check for Updates to install the latest version. Once iTunes is up-to-date, connect your iOS device. Click on your device in the upper-right corner of iTunes and then click the Update button. A pop-up window will appear, alerting you that a new iOS version is available for your device. Click the Download and Update button.

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