As I’ve written before, I switched from my Psion to a PDA-phone. Such an all-in-one device is useful, but I had not realized one result of this: While I’m holding my phone to the ear, I can’t access my PDA! Try checking your calendar while on the phone… oops.
Of course, this is exactly why I have a Bluetooth headset, and when I use that, there’s no problem. Except that the PDA’s Bluetooth radio seems rather poor; the other party hears me through static noise much of the time. What good is a quality headset if the PDA can’t cope?