Apple will release the iPhone OS 4.0 for the iPhone and iPod touch this summer. Is there any new improvement in this version? Well, If you curious with iPhone OS 4.0 features, check out this iPhone OS 4.0 Multitasking demo video below. The video shows you how the iPhone OS 4 features such as multitasking, displaying Home screen wallpaper, and arrange your applications in folders.

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