I think AT&T has changed their log in procedure in the past year (if not in the past couple of weeks), so the default values in the OS phone setup wizard don't work. I've got a BB Pearl, but I doubt these instruction would be any different.

octo8saktulos's method use to work for me a couple of months ago, but does not seem to work for me any longer. The latest time I've got a working connection I used the following:

I set up my phone using the phone wizard as normal. I then go to the connectivity in control panel, select connections, then edit the phone that just got added. I use the AT&T wizard settings, but change the username and passwork to blank; change the isp access point name to "isp.cingular" (no quotes) & the AT commands (under the small advanced button) to "AT+CDGCONT=1,"IP","isp.cingular"" (no end quotes). Keep/Change the phone number to *99***1#.

VulcanRidr - I think your setup is pretty close, but the AT commands are a bit off from mine. Give it a try and let us know how it turns out.

I pulled this off of AT&T Support site concerning setting up a XP computer to use DUN for a Bluetooth Device. Seems to work, but every time I flash (I've done this a couple times in the past 2 months), I have to jump through different hoops to get it to work. This is what worked on my last reflash.

Good luck.