Now let me come to the next obvious question, that is; Where are the drivers??
Well, if you are impatient, and if you have a 2.4x series kernel then go to
http://linmodems.technion.ac.il/pctel-linux/, and if you are stuck with the older 2.2.x kernels, go to http://modems.dewback.cl (the exact link for the file it self is http://modems.dewback.cl/pctel-2.2.tar.gz )
But there are a number of drivers in both the sites, and you will definitely feel confused..so read on.