Smart Bro WM66E on Ubuntu 12.04

Never thought how easy was it. Just follow the steps below and don't forget to edit product and vendor IDs.
 First off, plug your USB model dongle, and do the following command:

# lsusb
Bus 001 Device 005: ID 1c9e:98ff OMEGA TECHNOLOGY

- create a new file /etc/usb_modeswitch.d/1c9e:98ff containing the following code:

DefaultVendor = 0x1c9e
DefaultProduct = 0x98ff
TargetVendor = 0x1c9e
TargetProduct = 0x98ff
MessageContent="55534243123456788000000080000606f50402527000000000000000000000"

- Edit /etc/rc.local, and prepend the following code to exit 0:

sleep 10
modprobe usbserial vendor=0x1c9e product=0x98ff
usb_modeswitch -c /etc/usb_modeswitch.d/1c9e\:98ff

- reboot

- after rebooting, checkout your device details again.

# lsusb
Bus 001 Device 005: ID 1c9e:9803 OMEGA TECHNOLOGY

- after checking, follow the following steps:
modprobe option
echo "1c9e 9803" > /sys/bus/usb-serial/drivers/option1/new_id

Wait for few minutes and you'll see "Enable Mobile Broadband" on your network manager.