Connecting LG Rumor in Ubuntu 8.10

I bought the USB cable for my LG Rumor today. Not as expensive as I thought it would be at only $20. Well, I have read somewhere online about adding extra applications with the USB cale. So far, I've had nothing but problems. First of all, with the USB cable connected, and the phone in mass data mode, I can't get it to mount. Then, I called Sprint and set up their service for using the phone as a modem. Went through hell to figure out what settings I need from Sprint, and I still can't get it to work in Network Manager. Starting to get irritated now.