Finally I did it! I established a bluetooth connection to my mobile and used it as a modem to connect to the internet. It has actually been something that I started trying a couple of months ago. Back then I read about how to connect using bluetooth and how to use the mobile as a modem and to initialize a GPRS connection setting on the phone. I also got as far as to actually do the connecting and dialing, and I could see on the mobile that it was connected but I didn’t get a proper IP address and couldn’t reach the internet.
Since I have had a lot of other stuff to do and had almost forgotten about it entirely until yesterday when I decided to give it a last chance. I found out that I had use the wrong dial string for my mobile so I didn’t use the correct GPRS setting (duh!). When I saw Google load for the first time I couldn’t help shouting “YES”. Normally I don’t even recognize when I do that but this time I was in THE TRAIN on my way home (and even worse I sat in a cupe where you have to be quiet!).
So how did I do it? To be honest I don’t really know. But after having looked around a bit I found [this guide][guide], which pretty much describes what I did. The only difference is that I created two launchers on my panel which I use for starting and stopping the connection. Works like a charm 
[guide]: https://help.ubuntu.com/community/BluetoothDialup
