Four years later, has iPhone changed that much?

via cnn.com

(CNN) -- The iPhone turns 4 years old Wednesday.

By that we mean the "original iPhone," the one Apple CEO Steve Jobs announced in January 2007 and that went on sale -- to much fanfare and talk about a mobile "revolution" -- on June 29 that year.

It's hard to overstate the importance of that product on mobile computing, a field that really didn't exist until Apple came out with what was, at the time at least, probably the "smartest" and easiest to use of the smartphones.

In a presentation before showing off the iPhone -- which has a big touch screen and basically one button, a huge step away from the clickity-clack keyboards and postage-stamp screens of the day -- Jobs joked that Apple was just going to slap a rotary phone dial on top of an old-school iPod.

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