How to Update Your iPhone to the Latest Version of iOS Using Software Update

Step One
Press to launch Settings from your SpringBoard.

Step Two
Tap General from the Settings menu.

Step Three
Choose Software Update from the General menu.

Step Four
Your device will now check for updates.

Step Five
If an update is found you can tap Download and Install to begin the upgrade process. You should make sure you have sufficient battery power left and are on Wi-Fi before continuing.

Step Six
The firmware update will be downloaded to your device and prepared.

Step Seven
Apple will begin installing the software update unless you tap the Later button to cancel it. You can also tap Install to skip the timer.

Step Eight
Your iPhone will now reboot and begin installing the latest firmware. Once complete you will be returned to your SpringBoard.