Upgradable PDAs

[amaranthineApocalypse]

I like this idea, upgrading and adding tools to the PDA, upgrading the PDA to PDA plus or even a CELLPHONE!

I'm surprised this idea has never come up before.

There should be a speaker/microphone PDA module that allows you to connect your PDA to one other persons. Said PDAs then act like the bracelets that allow you to hear events from whoever else is wearing them. Except maybe with a little PDA symbol next to them so you can tell whats what.