Me in IT UNIX/Linux consultancy

Here is a step by step guide to help you get online with your iPhone using OS 3.0.

1. Go to this page: http://www.iphone-notes.de/mobileconfig/ It will send you an email. Download that email on you iPhone. It contains a profile to enable Tethering.
   
2. Now go to your iPhone preferences, under Network you can enable tethering, activate it
   
3. On your Mac Book Pro, go to the bluetooth preferences. Add your iPhone. I had to press "continue" on my Mac Book pro after accepting the pairing request on the iPhone. Waiting here resulted in an error.
   
4. On you Mac Book Pro, connect to your iPhone using bluetooth
   
5. Now on your Mac Book Pro, under Network Preferences, add a connection: "Bluetooth PAN".
   

You can now tether using your iPhone!

For tethering, an extra network interface is added, in my case "en5". To see what the IP-address of your connection is, open a Terminal and type:

In my case I see that I am using a private class (192.168.20.0/24) IP address. That means that T-Mobile in the Netherlands is NAT-ing my connection. Not a problem, but connecting back to my laptop is not possible from the internet.