iOS features an easy-to-use interface, amazing features, and rock-solid stability, and it is the foundation of iPhone. And even as other phones try to catch up, the technologies and features built into iOS 4 keep it years ahead of the competition.
You can use iTunes to update or restore iPhone or iPod software. Apple recommends updating iPhone or iPod touch to use the latest software. You can also restore the software, which puts iPhone or iPod touch back to its factory condition.


