Connect to a GSM network.

Fit in a small pocket.

Charge from USB.

Take 2-megapixel pictures.

Detect physical rotation and proximity to screen.

Detect multiple-finger presses (although thinking about it, the Nokia can distinguish stylus from thumb and I think the 800 is pressure-sensitive, so that doesn't really count).

I suspect that some of its UI effects (shrinking and cross-fading) may not be implementable either (partly because the 770/800 have more pixels to process). I can't remember if Canola does anything comparable.


I'm sure someone will tell me that the Nokia can connect to a cellphone and be hacked to charge from USB, but if we go down that route, this might turn into a long thread!