Apple iOS 5 Now Available
One key thing missing from the update, Siri. You can only get your hands on Siri with the purchase of a brand new iPhone 4S. If you feel like upgrading to the newest version of iOS though then you must have a compatible device, the latest iTunes and an internet connection for the download. Compatible devices include iPhone 4, iPhone 3GS, iPad, iPad 2 and iTouch 3/4.