Mike

I think your issue is that the BlackJack has a BT PAN profile not a BT DUN profile; others (like me) ran into the same issue with the T-Mobile Dash and the 770. The PAN profile is possible but requires much more effort than the DUN paring that is officially supported by the 770/800. Search the forums for "PAN" the procedures are there for the 770, by now they might even be there for the 800. Good luck, I just returned the Dash and stayed with my Samsung T509 because of the ease of connecting via BT DUN.