![iOS4 Now Available for Download!](https://img-cdn.tnwcdn.com/image?fit=1280%2C720&url=https%3A%2F%2Fcdn0.tnwcdn.com%2Fwp-content%2Fblogs.dir%2F1%2Ffiles%2F2010%2F06%2Fios-4-announce.jpg&signature=d6a822d931a02c9e37a53ad25ab25d91)
As promised, Apple has released iOS4, you should find it immediately available via software update in iTunes. If not, you can download the update direct here (thanks to Mac Stories):
This is a free update but only works with specific iPhone models: iPhone 3G with no multitasking, iPhone 3GS, iPhone 4 and 2nd / 3rd generation iPod Touches.
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