Listen Mr. "I'm too important to talk about mobile phones", it damn well is relevant to this forum. Just as the previous highly entertaining (and partly informative) discussions about suits, cufflinks and watches.
As a consultant, travelling and working out of town, my phone is one of my two most important work tools (the other one being my laptop).
So, on to the subject: I recomment the iPhone. I was originally sceptical since I viewed it as more of a toy, or an entertainment device. But support for multiple e-mail accounts is good. Sound quality is good. Can use the music headset for making hands-free calls. Contacts sync with Outlook. Calendar syncs with outlook. I don't use it to view or edit MS Office docs so not quite sure if it supports these. I think it does PDF attachments. On top of all this, you get your full CD collection to take with you on the road (and only have to carry a single device), can use it to watch video while travelling, can use the browser (or apps) to check flight and train times, plus you can facebook without the client seeing it on your laptop screen.
Comes with maps/gps so you can find your hotel and restaurants nearby.
You can even use the browser to check up on Top-Consultant.com (Tony (or the other moderator dude - forget your name) BTW - when do we get a mobile version of this chat board?).
Plus, you don't need to lug around a separate charger since it charges via USB using the sync cable.
So, to the critics of this thread. If you still don't see what all of this has to do with life as a consultants, please do explain.