Nitin, Have you tried the suggestion by scanModem: <quote> If your modem is an external USB type, connected by an external serial cable, or mounted internally on an ISA card, then scanModem would not access it. Try with Root permission $ sudo wvdialconf /etc/wvdial.conf to detect these modem types and some USB modems. If the detection is successful, read the DOCs/wvdial.txt . Edit the /etc/wvdial.conf with Root permission: sudo gedit /etc/wvdial.conf will be able to dial out with Root permission: sudo wvdial </quote> If you have and it*(modem) cannot be found, then more information would be needed: and seen by scanModem Attached USB devices are: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port Maybe model no. and searching through google will yield good results? Also, might be worth doing is getting usbmodeswitch :) http://www.draisberghof.de/usb_modeswitch/ See this thread below, might be helpful? http://ubuntuforums.org/showthread.php?t=1159413 Regards, Antonio On 7/25/10, Nitin Niroula <nitinniroula@xxxxxxxxx> wrote: > Dear All, > > I am trying to get net connection with cdma usb modem. I have attached > the modem data text file. Please help me. > > Nitin. >