Comment 9 for bug 889878

I've got the dongle working on Precise beta1. Though, I don't use NetworkManager but a script to invoke wvdial/pppd.
Note: 4G mode doesn't work under Linux even if you try to set it with usb_modeswitch.

$ cat e398-provide.sh
#!/bin/sh

sudo rmmod option
sudo modprobe option
sudo echo "12d1 1506" > /sys/bus/usb-serial/drivers/option1/new_id
sleep 30

sudo usb_modeswitch -v 12d1 -p 1505 -V 12d1 -P 1506 -M "55534243123456780000000000000011062000000100000000000000000000" -n 1
sleep 30

sudo wvdial provider

$ cat /etc/wvdial.conf
[Dialer provider]
Modem = /dev/ttyUSB0
Init = ATZ
Init1 = AT+CGDCONT=1,"IP","internet"
Phone = *99#
#Username = "your_username"
#Password = "your_password"
Stupid Mode = 1
New PPPD = yes