Evergreen, I apologize for overlooking several important details. I had seen prior to your mail, several messages regarding CDMA modems under linux http://www.linuxquestions.org/linux/answers/LinuxQuestions_org/CDMA_modem_phone_Howto You should see some lines like cdma? when you do a dmesg Also your wvdial.conf file shows /dev/ttyUSB0 while your GNOME-PPP shows /dev/ttyS0 which is for serial modems and not USB's. What happens when you unplug your modem and replug it, play dmesg and see relevant lines, and if you can save your wvdial.conf file and recreate it with $ sudo wvdialconf /etc/wvdial.conf and see if the same device name appears /dev/ttyUSB0, it can change to /dev/tttyUSB1, but why not try to see what happens? I saw the following which may? help http://ubuntuforums.org/showthread.php?t=248368 Let us know what happens. Regards, Antonio On 10/31/09, Evergreen Tours <chitragurung@xxxxxxxxxxx> wrote: > When I use gnome ppp I got the following error. > > -> Ignoring malformed input line: ";Do NOT edit this file by hand!" > --> WvDial: Internet dialer version 1.60 > --> Cannot open /dev/ttyS0: Input/output error > --> Cannot open /dev/ttyS0: Input/output error > --> Cannot open /dev/ttyS0: Input/output error > > >