Remove the line that contains '19d2' from /lib/udev/rules.d/61-option-modem-modeswitch.rules, then unplug your device, and replug it. Make sure you still have usb_modeswitch set up to flip the device to modem mode. modem-manager should then be able to use the device.
Actually, give this a try:
Remove the line that contains '19d2' from /lib/udev/ rules.d/ 61-option- modem-modeswitc h.rules, then unplug your device, and replug it. Make sure you still have usb_modeswitch set up to flip the device to modem mode. modem-manager should then be able to use the device.