Ubuntu :: Using Cellphone As Bluetooth Modem In Hardy?

I recently got myself a bluetooth dongle. I frequently use my Sony Ericsson K800i mobile phone as a modem to connect my computers to the internet. I've had to use a USB datacable to link phone to computer, so I'm pretty stoked at the idea of using a bluetooth connection instead.

I used this tutorial to set up the modem connection. It's a bit aged: it was written in the days of 6.10, and goes on about bluez-utils; but it wasn't hard to update it, for instance replacing the command

Code:
sudo /etc/init.d/bluez-utils restart
with
Code:
sudo /etc/init.d/bluetooth restart

and there's now a little graphic interface to pair devices and such, whereas when the tutorial was written you had to use command-line to pair and authenticate. Also, I use Gnome-PPP to start the internet connection rather than the ponand poff commands suggested in the tutorial.

I can connect to the phone/modem simply enough now with my EeePC running Jaunty. But when I put the same dongle in my Hardy-running desktop machine, I cannot establish a link. This really puzzles me: the same bluetooth device is being used in both cases, and I'm following the tutorial in both cases so I'm doing the same in both cases. I can do other stuff with the dongle and the Hardy box: for instance I can transfer files from one to the other. It's just the dial-up internet function that won't work.

I realise the next LTS version (Lucid) is coming out soon; and I'm pretty confident the bluetooth modem connection will work okay with Lucid. But in the meantime, I really would like to use the bluetooth connection now. Sometimes my phone can get a 3G signal only if it's sitting onmy window sill, and the datacable isn't long enough to do that. So, if anyone can point me in the right direction for info on how to use a phone as bluetooth modem with Hardy,