Telstra Ultimate USB modem using Ciscos VPN Win 7

Install Latest firmware then install drivers.

http://www.sierrawireless.com/en/sitecore/content/Sierra%20Wireless/Support/Downloads/AirCard/USB_Modems/Telstra_Ultimate_AC312U.aspx

Disable “Windows 7 Mobile Broadband” in the telstra Watcher "user options"

Ref

http://forums.whirlpool.net.au/archive/1709121