Apple released iOS 4 for the iPhone and iPod touch on Monday. The major OS upgrade includes several new features such as third-party multi-tasking support and Bluetooth keyboard support.
iOS 4 also includes features such as the ability to group apps in folders, Home screen wallpapers, a unified in box in Mobile Mail, and more. More iOS 4 feature highlights are available at TMO, too.
Installing the OS upgrade requires an Internet connection and iTunes 9.2, and isn’t compatible with the original iPhone. The upgrade is available as a free download.