Unable to connect with ZTE AC2791 USB modem (19d2:fffe) - wvdial works fine

[Nilesh Trivedi]

ModemManager (version 0.6.0.0, Ubuntu 13.10) is unable to connect to
internet via ZTE AC2791 USB modem (USB id 19d2:fffe). The device is
modeswitched correctly, the menu item shows up correct in NM-applet but
after connecting, it immediately gets disconnected, the UI shows the entry
as "Label Empty" and cannot be connected again.

Wvdial is able to provide a stable connection with the same device with
config parameters given as per this blog post:
http://www.anuragbhandari.com/2011/01/bsnl-evdo-in-linux-the-easy-way/
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