I have the same problem on 16.04. The usb mode switch does not trigger
properly.

The following workaround works for me:

To fix automatic switching, a new udev rule is required (do not modify the 
original automatic rule in /lib/udev/rules.d/40-usb_modeswitch.rules). Create 
the file /etc/udev/rules.d/39-usbmodeswitch-custom.rules with:
------------------------
# Hack: specifc rule for switching Huawei E3276 and similar modems
SUBSYSTEMS=="usb", ACTION=="add", ATTRS{idVendor}=="12d1", 
ATTRS{idProduct}=="1f01", RUN+="/etc/udev/rules.d/switch_usb_mode.sh"
------------------------

Next create an executable script (chmod +x) 
/etc/udev/rules.d/switch_usb_mode.sh:
---------------------------
#!/bin/bash
# switch HUAWEI modem to modem-mode using Huawei new mode option J
usb_modeswitch -J -v 0x12d1 -p 0x1f01
---------------------------

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https://bugs.launchpad.net/bugs/1198283

Title:
  Huawei E3276 will not recognized correctly

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