The command line modem documentation can be found . The Desktop automates much of that detail, using the following dialog:

This dialog assumes that you have pppd installed and that the system permissions allow you to run it, or that you have one of the supported GUI sudo packages installed (gksu or beesu).

It lists the available ppp scripts for the known providers. It will also remember which one you chose last.

The password is optional, depending on your device setup.

Upon launching the modem connection, the pppd output will appear in a separate xterm window. You can cancel your connection at any time by pressing Ctrl-C in that window.