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But isn't phone (aka "voice") just another kind of data? Or at least, shouldn't it be considered as such?
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Yes, I agree. That's why I said if you add GSM to a PDA, you can still call it a PDA. Or call it a phone, or smart phone, or whatever you want- 
Like you said, each form factor is typically optimized for certain usage. It's much easier to design a device to do 1 thing well, than to do 3 or 4 things well.
Tablet PC's are nice, but what we consider as PDA's still have some advantages. Very little moving parts, instant on, long battery life, optimized operating systems, very pocketable, etc. Someday there will be a TabletPC or whatever PC that has those features, and you may as well call it a PDA just the same- the main technical difference is just the OS, both devices seem designed for mobile use.
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