Comment 6 for bug 1579290

Sep 1 17:29:45 x1c NetworkManager[2651]: <info> [1472743785.5455] device (cdc-wdm0): Activation: starting connection 'phonero connection' (70ad7e3b-28fa-4128-96f7-716dae3dee23)
Sep 1 17:29:45 x1c NetworkManager[2651]: <info> [1472743785.5456] audit: op="connection-activate" uuid="70ad7e3b-28fa-4128-96f7-716dae3dee23" name="phonero connection" pid=3729 uid=1000 result="success"
Sep 1 17:29:45 x1c NetworkManager[2651]: <info> [1472743785.5457] device (cdc-wdm0): state change: disconnected -> prepare (reason 'none') [30 40 0]
Sep 1 17:29:45 x1c NetworkManager[2651]: <info> [1472743785.5458] manager: NetworkManager state is now CONNECTING
Sep 1 17:29:45 x1c ModemManager[2654]: <info> Simple connect started...
Sep 1 17:29:45 x1c ModemManager[2654]: <info> Simple connect state (4/8): Wait to get fully enabled
Sep 1 17:29:45 x1c ModemManager[2654]: <info> Simple connect state (5/8): Register
Sep 1 17:29:45 x1c ModemManager[2654]: <info> Simple connect state (6/8): Bearer
Sep 1 17:29:45 x1c ModemManager[2654]: <info> Simple connect state (7/8): Connect
Sep 1 17:29:45 x1c ModemManager[2654]: <info> Modem /org/freedesktop/ModemManager1/Modem/0: state changed (registered -> connecting)
Sep 1 17:29:46 x1c ModemManager[2654]: <info> Modem /org/freedesktop/ModemManager1/Modem/0: 3GPP Registration state changed (home -> unknown)
Sep 1 17:29:46 x1c ModemManager[2654]: <info> Modem /org/freedesktop/ModemManager1/Modem/0: 3GPP Registration state changed (unknown -> searching)
Sep 1 17:29:47 x1c ModemManager[2654]: <info> Modem /org/freedesktop/ModemManager1/Modem/0: state changed (connecting -> searching)
Sep 1 17:29:47 x1c NetworkManager[2651]: <warn> [1472743787.0194] (cdc-wdm0): failed to connect modem: Unknown error (50)
Sep 1 17:29:47 x1c NetworkManager[2651]: <info> [1472743787.0194] device (cdc-wdm0): state change: prepare -> failed (reason 'unknown') [40 120 1]
Sep 1 17:29:47 x1c NetworkManager[2651]: <info> [1472743787.0200] manager: NetworkManager state is now DISCONNECTED
Sep 1 17:29:47 x1c NetworkManager[2651]: <info> [1472743787.0202] (cdc-wdm0): modem searching; disabling autoconnect
Sep 1 17:29:47 x1c NetworkManager[2651]: <warn> [1472743787.0207] device (cdc-wdm0): Activation: failed for connection 'phonero connection'
Sep 1 17:29:47 x1c NetworkManager[2651]: <warn> [1472743787.0215] device (cdc-wdm0): overwriting previously queued state change to disconnected (none)
Sep 1 17:29:47 x1c NetworkManager[2651]: <info> [1472743787.0220] device (cdc-wdm0): state change: failed -> unavailable (reason 'modem-failed') [120 20 57]
Sep 1 17:29:47 x1c ModemManager[2654]: <info> Modem /org/freedesktop/ModemManager1/Modem/0: 3GPP Registration state changed (searching -> registering)
Sep 1 17:29:47 x1c ModemManager[2654]: <info> Modem /org/freedesktop/ModemManager1/Modem/0: 3GPP Registration state changed (registering -> home)
Sep 1 17:29:47 x1c ModemManager[2654]: <info> Modem /org/freedesktop/ModemManager1/Modem/0: state changed (searching -> registered)
Sep 1 17:29:47 x1c NetworkManager[2651]: <info> [1472743787.1532] device (cdc-wdm0): state change: unavailable -> disconnected (reason 'modem-available') [20 30 58]
Sep 1 17:29:47 x1c ModemManager[2654]: <info> Modem /org/freedesktop/ModemManager1/Modem/0: 3GPP Registration state changed (home -> unknown)
Sep 1 17:29:47 x1c ModemManager[2654]: <info> Modem /org/freedesktop/ModemManager1/Modem/0: 3GPP Registration state changed (unknown -> searching)
Sep 1 17:29:48 x1c ModemManager[2654]: <info> Modem /org/freedesktop/ModemManager1/Modem/0: 3GPP Registration state changed (searching -> registering)
Sep 1 17:29:48 x1c ModemManager[2654]: <info> Modem /org/freedesktop/ModemManager1/Modem/0: 3GPP Registration state changed (registering -> home)

dpkg --list |grep libqmi
ii libqmi-glib5:amd64 1.16.0-1 amd64 Support library to use the Qualcomm MSM Interface (QMI) protocol
ii libqmi-proxy 1.16.0-1 amd64 Proxy to communicate with QMI ports
ii libqmi-utils 1.16.0-1 amd64 Utilities to use the QMI protocol from the command line

dpkg --list |grep modemmanager
ii modemmanager 1.6.0-1 amd64 D-Bus service for managing modems

dpkg --list|grep libmbim
ii libmbim-glib4:amd64 1.14.0-1 amd64 Support library to use the MBIM protocol
ii libmbim-proxy 1.14.0-1 amd64 Proxy to communicate with MBIM ports
ii libmbim-utils 1.14.0-1 amd64 Utilities to use the MBIM protocol from the command line

uname -a
Linux x1c 4.4.0-36-generic #55-Ubuntu SMP Thu Aug 11 18:01:55 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux