Cannot pair bluetooth with iPhone

Hi!
I am trying to pair my Macbook Pro (10.6.4) with my iPhone (3GS, iOS4.0.2) via bluetooth in order to get internet tethering to work.
When I initiate the pairing from the Macbook, the "Bluetooth Setup Assistant" finds my iPhone, attempts to pair and shows me in big numbers the code. On the iPhone, an alert pops up to confirm that "...woult like to pair with your iPhone" and to confirm the passkey is the right one.
I now press "Pair" on the iPhone, and a few seconds later an alert pops up, saying "Could not pair with ..."
I can pair different devices to my Macbook (keyboard, mouse,...) and also the iPhone pairs without problems with a company Dell laptop, just Apple with Apple seems not to work.
Rebooted both Mac and iPhone, no success. And, no, the iPhone is not jailbroken.
Does anyone have any idea how to get this to work? Thanks lot!!
Cheers,
Hendrik

Post in one forum area only please. In any case try over in the iPhone forums:
http://discussions.apple.com/category.jspa?categoryID=201
in as much as that is what your post is related to.

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