Comment 61 for bug 1057186

@Peter: thanks, so, your device has a completely different firmware with completely different results. In your case we get:

 (/sys/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.3) tty/ttyUSB2 primary
 (/sys/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.3) tty/ttyUSB0 secondary
 (/sys/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.3) tty/ttyUSB2 data

Which is wrong.

In your modem AT^U2DIAG? actually fails and AT^SETPORT? doesn't, completely the opposite to what we had in @hanynowsky's log. But the bug ends up being that the modem says the NDIS port is enabled, while it seems it isn't. Reported the issue upstream, see the following thread for the discussion:

https://mail.gnome.org/archives/networkmanager-list/2012-October/msg00137.html