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Case in point: look at this image of iPod touch from Apple's site, and you'll notice it has a Phone app icon, which definitely doesn't belong there. To see the real icon layout on an iPod touch, check out this page.
We'd call it an honest mistake (and a case of lazy Photoshopping), but given how much attention Apple's gadgets attract, it's likely to spark conspiracy theories about the iPod really getting a phone app, and we know that's not happening. Or is it?