Hello,
What's the lsusb output after plugging in the usb modem?
[arun@localhost ~]$ lsusb
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 006 Device 002: ID 15d9:0a4c Trust International B.V. USB+PS/2
Optical Mouse
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 005: ID 19d2:fffe ONDA Communication S.p.A.
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 05a9:2640 OmniVision Technologies, Inc. OV2640 Webcam
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
[arun@localhost ~]$
Regards,
Arun Prakash