Blackberry 3G Bluetooth Modem for Kubuntu
First, get the GPRS files
Edit and Install
The files will need to be editted based on your particular set-up. The pegelinux blog has some pretty good instuctions.
Some of the edits are provider specific. I found this APN Reference Table with info on most providers. The AT&T info worked for me.
Make the Connection
pppd call gprs should make it work when done. I just wrap that up in a bash script in my $HOME/bin directory so, it's a shortcut away. Now when travelling, I don't need to pay the $10/tmobile/starbucks fee just to check mail.