Vodafone K5005 (Huawei E389) 4G modem on Ubuntu

This modem works with Ubuntu Precise Pangolin (12.04) but it is not detected automatically by network manager.

UPDATE: In the comments, a reader named "Big Brother" has a nicer solution, instead of using the scripts below, just follow this steps:

1- Add these lines to /lib/udev/rules.d/40-usb_modeswitch.rules:

# Vodafone K5005 (Huawei E398)
ATTRS{idVendor}=="12d1", ATTRS{idProduct}=="14c3", RUN+="usb_modeswitch '%b/%k'"

2- Create file /etc/usb_modeswitch.d/12d1:14c3:

# Vodafone K5005 (Huawei E398)
TargetVendor= 0x12d1
TargetProduct= 0x14c8
MessageContent="55534243123456780000000000000011062000000100000000000000000000"

3- Unplug device, plug it back and it should work automagically ;)

Deprecated method:
In order to get it working with network manager I have to use the following script (it must be ran as root):

#!/bin/bash
rmmod option
modprobe option
echo "12d1 14c8" > /sys/bus/usb-serial/drivers/option1/new_id
usb_modeswitch -v 12d1 -p 14c3 -V 12d1 -P 14c8 -M "55534243123456780000000000000011062000000100000000000000000000" -n 1

Note that the commands above are for the Vodafone branded (K5005) Huawei E389 dongle, for the unbranded device the product ID is different and you should use:

#!/bin/bash
rmmod option
modprobe option
echo "12d1 1506" > /sys/bus/usb-serial/drivers/option1/new_id
usb_modeswitch -v 12d1 -p 1505 -V 12d1 -P 1506 -M "55534243123456780000000000000011062000000100000000000000000000" -n 1

You can check the product id with:

lsusb

In my case I get:

Bus 002 Device 007: ID 12d1:14c3 Huawei Technologies Co., Ltd.