Love it, hate it, whatever, but it completely revolutionized what is practically access to "everything". You will be hard pressed to find an American consumer, from the richest guy to homeless people on the street that don't have a mobile communications device on their person with a touch screen and instant access to the collective works of the world.
The iPhone by itself as a stand alone business would be larger than Microsoft, Coca-Cola, and McDonalds among other revolutionary businesses.