This is what Ico(gagandeep) had once told me for my CDMA modem,
1. Just download this executable…..bsnlclarity and save it to your home folder.
2. Connect your phone to the system with the usb cable.
3. Now at terminal type
$ sudo ./bsnlclarity
You will be asked for your username and password for accessing the internet enter it …..
now start surfing.
I didn't try it yet!! See if it works!
Also check this,
How to setup Internet Connection in Ubuntu 8.10??