If you need to find the magic secret sauce to get a Vodafone/Huawei K4606 going under linux then the following will help.
Stick the following contents into a file under /etc/usb_modeswitch.d/12d1\:1f19 (the backslash is to escape the colon in the shell)
# Vodafone Mobile Broadband (Huawei) K4606
DefaultVendor= 0x12d1
DefaultProduct= 0x1f19
TargetVendor= 0x12d1
TargetProduct= 0x1441
MessageContent="55534243123456780000000000000011062000000000000200000000000000"
Then, make sure that usb_modeswitch is invoked by Udev during hotplug by editing /etc/udev/rules.d/40-usb_modeswitch.rules
and then adding
ATTRS{idVendor}=="12d1", ATTRS{idProduct}=="1f19", RUN+="usb_modeswitch '%b/%k'"