How can I update my iPhone firmware / OS?
Your iPhone requires iOS firmware updates from Apple every once in a while to fix problems, add new features and plug security holes. To update the operating system on your iPhone to the latest release, follow these instructions:
1. Turn your iPhone on and connect it to your computer with the USB cable.
2. Launch iTunes.
3. Select the name of your iPhone in DEVICES on the left menu in the iTunes window.
4. Click the Check for Update button under Version on the main screen.