For info about accessing Internet using LG/SAMSUNG CDMA sets via USB cable go to http://www.hackgnu.org/ril-howto.html.
This link is also helpful: http://www.linuxsolved.com/forums/ftopic1178.html.
All the information in this HOWTO comes partly from these two links, the PPP-HOWTO and partly from my research and development in the Linux world.