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> Bandwidth limitations.

This is going to be a big problem - the simple physics of it, means it's much more limited than wired.

> I write mobile software for a living

I always wondered about that. Do you write native apps, or is it some kind of HTML? I see so many: WAP, WML, XHTML-MP. Which do I use if I want to get started?

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I personally write native apps. J2ME for most low end AT&T phones and blackberries. Brew (A SDK straight out of the 80's built on non-static C) for Verizon. Java on Android for the Google phones and, of course, Objective C on Mac OS for iPhones.

I'll work with any 3 of these platforms in a given day. 2 if I'm lucky, 1 if there's a looming deadline ;-)

It really depends on the market you're trying to address. I would assume that most phones sold in the developed markets in the last two years have browsers with XHTML+CSS support. But, tons of low end phones are still sold the world over. They may support only WAP. We started with WAP on a project and quickly gave up.

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