The biggest difference between the iPhone and all other cell phones is the Mac OS X interface. Shrinking the size of the phone would make it harder to use and might even require significantly different software. Apple is already making Mac OS X, iCal, iPhoto, Safari, iTunes, Aperture, Final Cut Pro, iMovie, iPod software, Mobile OS X (for iPhone and iPod Touch), and lots of other software. I can't imagine that Apple would want to introduce a whole new platform just to reduce the size a little. The iPhone is already the world's best phone, so there's no reason to change it that much.
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