The Sierra Wireless USB 598 currently offered through Telus *almost* works on Ubuntu 9.04 out of the box. A Windows or Mac box is needed to install the "Watcher" program that allows for the automatic online configuration of the Sierra Wireless USB 598. Aside from the requirement of Windows/Mac the card was immediately picked up and ready to go.
After unsuccessfully trying to get the Sierra Wireless USB 598 running on Ubuntu 8.04 LTS (Hardy Heron) and the default Dell-branded Ubuntu 8.04 supplied on the Dell Inspiron Mini 10 I found success with Ubuntu 9.04 (Jaunty Jackalope) Netbook Remix.
Here is one interesting fact:
The wireless network is firewalled from external connections. This means no outside SSH connections from external IP addresses. Check out the nmap:
Starting Nmap 4.53 ( http://insecure.org ) at 2009-08-27 13:57 PDT
All 1714 scanned ports on bowness-out.eng.telusmobility.com (18.104.22.168) are filtered
Nmap done: 1 IP address (1 host up) scanned in 345.460 seconds