Here ya go, but not specific to the devices you are using, but a good step by step using Bluetooth phone as a modem for a laptop (so the device may not be the same the way to ge to what you want my help).
http://www.smartphonethoughts.com/articles.php?action=expand,7365:dont_paginate,1
the Other one with the UK settings was just for being able to see which settings you might have to look into to get where you needed to get (as far and the two devices).
The above has screen shots as well that may help you more in devling into the two devices to get at the settings.
These two links might be of better help and they are Cingular specific
http://www.golod.com/2005/03/cingular-wap-dial-up-networking-settings/
John Higdon's #3 post, on the link below may be of the greatest help to you.
http://groups.google.com/group/ba.internet/browse_frm/thread/8c67bc4576d89339/331b71555b418c84?lnk=st&q=bluetooth+pairing+to+access+the+internet+using+Cingular&rnum=4&hl=en#331b71555b418c84
Further reading for anyone interested in this topic:
http://turtiainen.dna.fi/GPRS-HOWTO
http://www.unrooted.net/hacking/bluetooth-dialup.html
http://www.howardforums.com/archive/topic/222949-1.html
http://www.howardforums.com/archive/topic/215499-1.html
http://www.geekzone.co.nz/forums.asp?ForumId=8&TopicId=683
http://www.majid.info/mylos/weblog/2003/05/13-1.html
http://www.newsfactor.com/perl/story/18653.html
http://www.cingular.com/about/latest_news/03_06_04
http://www.pocketpcthoughts.com/forums/viewtopic.php?t=16352