You might want to check out usb_modeswitch. When these devices are first plugged in, they are recognized by the computer as a mass storage device (with the drivers on it). Once the drivers are loaded, they tell the device to switch from being a mass usb storage device, to a usb serial modem.
More info here
Notice that the WM66 modem shares a similar config as the Alcatel OT-X020.