Did you try the tips in the forum post here?:
http://askubuntu.com/questions/525965/huawei-e3272-ubuntu
** Tags added: vivid
** Also affects: usb-modeswitch (Ubuntu)
Importance: Undecided
Status: New
** Changed in: usb-modeswitch (Ubuntu)
Status: New => Incomplete
** Changed in: modemmanager (Ubuntu)
Status: Incomplete => New
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https://bugs.launchpad.net/bugs/1404068
Title:
No internet connection with Huawei E3272 4G modem
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