How to update the software on my iPhone wirelessly
1. Touch Settings.
2. Touch General.
3. Touch Software Update.
4. If an update is available, touch Download and Install.
5. Enter your passcode.
6. Read the terms and conditions, then touch Agree.
7. Touch Agree.
8. Touch the desired download option (E.g., Don't Use Mobile Data).
9. The update will now start to download.
10. Touch Install Now.
11. Your iPhone will restart to complete the update.