Configuring Huawei E3276 modem
I got my Huawei E3276 running on (K)Ubuntu 14.04.3 (and 14.04) by creating the following file:
# custom udev rules for UMTS modems
ACTION=="add", SUBSYSTEM=="usb", ATTRS{idVendor}=="12d1", ATTRS{idProduct}=="14fe", RUN+="/usr/sbin/usb_modeswitch -v 12d1 -p 14fe -M '55534243123456780000000000000011062000000100000000000000000000'"
ACTION=="add", SUBSYSTEM=="usb", ATTRS{idVendor}=="12d1", ATTRS{idProduct}=="1506", RUN+="/bin/bash -c 'modprobe option && echo 12d1 1506 > /sys/bus/usb-serial/drivers/option1/new_id
I saved this as /lib/udev/rules.d/70-usb-modeswitch.rules.