How to update the software on my iPhone using iTunes
1. On your computer, start iTunes.
2. Connect your iPhone to your computer using the USB cable.
3. Click on Continue.
4. On your iPhone touch Trust.
5. Click Check for Update.
6. If there is an available update, follow the on-screen instructions otherwise click OK.
Note: Screens, functions and options shown in this guide are for reference only and may only be applicable to certain models of phone.