How to update the software on my Apple iPhone 3GS wirelessly

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When updates are available, you can upgrade the software on your Apple iPhone 3GS for new features.
Here, we show you how to update the software wirelessly ("over the air").
1. Touch Settings.
2. Touch General.
3. Touch Software Update.
4. Wait while your iPhone searches for updates.
5. If an update is available, touch Download and Install.
6. Touch Agree.
7. Connect your iPhone to a power source and touch OK.
8. Wait while the software update is downloaded.
9. Your iPhone will restart and install the update.