Need help USB modem

[Roger]

sudo wvdial reports:
>
>
>     --> WvDial: Internet dialer version 1.61
>     --> Cannot get information for serial port.
>     --> Initializing modem.
>     --> Sending: AT+CGDCONT=1, "IP", "telstra.internet"
>     OK
>     --> Modem initialized.
>     --> Sending: ATDT*99#
>     --> Waiting for carrier.
>     CONNECT 21000000
>     --> Carrier detected.  Starting PPP immediately.
>     --> Starting pppd at Sat Mar  3 09:21:43 2012
>     --> Pid of pppd: 1965
>     --> Using interface ppp0
>     --> Disconnecting at Sat Mar  3 09:21:45 2012
>     --> The PPP daemon has died: A modem hung up the phone (exit code
>     = 16)
>     --> man pppd explains pppd error codes in more detail.
>     --> Try again and look into /var/log/messages and the wvdial and
>     pppd man pages for more information.
>     --> Auto Reconnect will be attempted in 5 seconds
>     --> Cannot get information for serial port.
>     --> Initializing modem.
>     --> Sending: AT+CGDCONT=1, "IP", "telstra.internet"
>     OK
>     --> Modem initialized.
>
>     It then repeats the above a number of times.
>
>     ^CCaught signal 2:  Attempting to exit gracefully...
>     --> Disconnecting at Sat Mar  3 09:21:49 2012
>
>     I have tried both telstra.bigpond and telstra.internet, makes no
>     difference.
>
>
>     Roger
>
>
> It sounds like you are making some progress at least.  I came across 
> this while looking for more information:
>
> http://us.generation-nt.com/answer/sierra-aircard-312u-not-connecting-help-203152682.html 
>
>
> Which basically says that the usb device address is incorrect and 
> needs to be changed.
>
> Try using different USB device files in 
> /etc/sysconfig/network-scripts/ifcfg-ppp0
>
> The line of interest is MODEMPORT=/dev/ttyUSB3
> See if maybe ttyUSB0, ttyUSB1, or ttyUSB2 work instead (provided it is 
> using ttyUSB3).
>

thanks for your help, I just checked , there is no  
/etc/sysconfig/network-scripts/ifcfg-ppp0 in ubuntu.
Roger

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