iOS 4 Now Available to Download

Apple’s (s aapl) mobile operating system update, iOS 4, is now available to download via iTunes.

The updated operating system, previously known as the iPhone OS, features more than 100 new features. However, in order to download the 378MB update, you will need the latest version of iTunes (version 9.2), so be sure you are all up to speed before trying to upgrade.

iOS 4 can be installed for free on the older iPhone 3G and the current iPhone 3GS, in addition to the second- and third-generation iPod touch. An iPad-friendly version of the OS is expected later in the year.

The main features that the new OS offers includes multitasking, a unified inbox, folders for better application organization, the introduction of Game Center and more. Apple’s own site has an informative run-down of what iOS 4 brings to the table.

Check out the iOS update and let us know if you have any problems.