Linux is notorious for diffcult to get USB Modem to work for dialup networking. (Built-in Modem on most notebook are so called Winmodem. It's used to be difficult to get them to work as well but much progress has been made thanks to http://www.linmodems.org/)
After much research and a little bit of experimentation, I got a Dynex DX-M300 USB modem working on Xubuntu. This modem is relatively cheap and easy to find online. Here are my steps:
1) Download the HSF driver from Linuxant. Choose the link for Ubuntu.
2) Install using dpkg (i.e. Method B on this page)
3) Open a terminal and run wvdialconf
4) Edit /etc/wvdial.conf and change Phone/Password/Username for your ISP
5) Run wvdial. It will dial the number and make the PPP connection for you. After it connects successfully, it will show the local and remote IP as well as the primary/secondary DNS server IP. Keep the terminal open.
6) Now you could surf web!
Notes:
1) For some reason the modem doesn't work after I boot the machine with it plugged in. In that case only the power light come on. I had to disconnect and reconnect. Then the MR light will also come on and it will work.
2) The free version of the Linuxant driver has its max speed limited to 14.4kbps. If you want to go full speed at 56k, you could buy a license from them for $20. (I haven't tried it)
3) If your modem is plugged into USB and is detected properly, lsusb should show:
Bus 002 Device 002: ID 0572:1301 Conexant Systems (Rockwell), Inc.
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