operating system. It's also got a new name - iOS - signifying the importance of the iPad alongside the iPhone.
And what's more, iOS 4 is available to users of the iPhone 3GS, third-gen iPod touch and 3G too (albeit with limited features with the latter). iOS 4 will be available for the iPad later in the year.
We've delved right under the hood of the new iPhone to bring you 20 essential iOS4 and iPhone 4 tips.
