Bluetooth PAN (iPhone tethering) fails to establish network connection

I tried to connect my Macbook Pro to the internet using my iPhone's UMTS link. It work using the USB cable, but fails with Bluetooth. The behavior is strange:
a) The "Network" system preference shows "Bluetooth PAN - not connected" in the interface list
b) I click on connect (device is my iPhone)
c) the Bluetooth icon changes to gray with a dashed horizontal line (meaning "connected")
d) The interface "Bluetooth PAN" still shows "not connected" in the left column, but the right side shows a Disconnect button. Internet access does not work.
e) I can disconnect; the bluetooth icon reverts to its default shape.
Question: Why is there no IP connection when the link to the iPhone is established?

There is a bug, that requires to remove all other pairings with bluetooth devices before tethering will work.
http://forums.mactalk.com.au/31/67260-iphone-bluetooth-tethering-not-working.htm l#post923436

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