Is the Motorola Bluetooth compatible? If so, that's the way to go.
You should get all the software you need with the Bluetooth PCMCIA card, and it's a brilliant solution. It plugs and plays in a couple of minutes.
Have you looked at the Vodafone 3G solution. I am going to take a look, and if I like it I might even sell you my Bluetooth card for a snip!
Timothy