Wait for some seconds or disable and enable networking.
Type modprobe usbserial vendor=0x2001 product=0xa403 for switching your device to modem (please pay attention to give your product and vendor id which was noticed by you in step 1) Type eject /media/cdrom for ejecting the usb device. Type mkdir /media/cdrom for creating the directory here product id is 2001 and vendors id is a403. Mine was Bus 002 Device 012: ID 2001:7d0b D-Link Corp. Type lsusb in terminal and note down the product id and vendors id
