I am wondering if Linspire contained a (possibly proprietary
) driver for the modem that FC doesn't have. If you're not averse to a little leg work, assuming you did not get a Linspire disk with the computer, you could download the propretary enabled version of FreeSpire, install it and see if it can handle the modem. If so, you can find out what driver it is using and see whether your distro of choice contains that driver. If it is a proprietary driver, you might be up a creek ...