USB Modem issue

[Sundar Dhanasekaran]

Hi,

I am using USB datacard on my Ubuntu 8.04.  I am able to connect and use 
the internet services.  But when the connection fails, I am not able to 
connect back without rebooting the system.  The modem does not seem to 
be identified.  Not sure why. 

Error I get -

--> WvDial: Internet dialer version 1.60
--> Cannot get information for serial port.
--> Initializing modem.
--> Sending: ATZ
--> Sending: ATQ0
--> Re-Sending: ATZ
--> Modem not responding.

$lsusb
Bus 005 Device 001: ID 0000:0000 Bus 004 Device 001: ID 0000:0000 *Bus 
003 Device 003: ID 12d1:1001 Huawei Technologies Co., Ltd. E620 USB Modem*
Bus 003 Device 001: ID 0000:0000 Bus 002 Device 001: ID 0000:0000 Bus 
001 Device 001: ID 0000:0000

Any pointers on why I have to reboot and how to avoid it?

-Sundar