I am currently trying to get this to work. I followed the FAQ instructions found here Using BlackBerry As Modem - BlackBerryFAQ
I'm using a TMobile RIM BlackBerry Pearl 8100, and my plan has unlimited internet and email.
The only thing that I think I setup wrong is the username and password. I don't recall setting up a username and password with this phone when I initially purchased this (online at Tmobile.com). The only username and password that I know I setup was the one to pay my bills online at myTmobile.com.
I tried calling Tmobile tonite and they didn't know what username and password that I was asking for so they just gave me the web site one over. Which I already had. They did mention that my phone had a username account and password, but I could only get that by visiting a tmobile retail store. Any help is greatly appreciated.
btw, my laptop has Windows Vista Ultimate installed on it.