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System name: ubuntu 14.04 64 bit.

installed releases: 
ii  libmm-glib0:amd64                                     1.0.0-2ubuntu1                                      amd64        D-Bus service for managing modems - shared libraries
ii  modemmanager                                          1.0.0-2ubuntu1                                      amd64        D-Bus service for managing modems
ii  network-manager                                       0.9.8.8-0ubuntu7                                    amd64        network management framework (daemon and userspace tools)
ii  network-manager-gnome                                 0.9.8.8-0ubuntu4.2                                  amd64        network management framework (GNOME frontend)
ii  network-manager-openvpn                               0.9.8.2-1ubuntu4                                    amd64        network management framework (OpenVPN plugin core)
ii  network-manager-openvpn-gnome                         0.9.8.2-1ubuntu4                                    amd64        network management framework (OpenVPN plugin GNOME GUI)
ii  network-manager-pptp                                  0.9.8.2-1ubuntu2                                    amd64        network management framework (PPTP plugin core)
ii  network-manager-pptp-gnome                            0.9.8.2-1ubuntu2                                    amd64        network management framework (PPTP plugin GNOME GUI)
ii  network-manager-vpnc                                  0.9.8.6-1ubuntu2                                    amd64        network management framework (VPNC plugin core)
ii  network-manager-vpnc-gnome                            0.9.8.6-1ubuntu2                                    amd64        network management framework (VPNC plugin GNOME GUI)


Modem can not be initialized by using modem manager. wvdial option is
working for the modem.


In the wvdial conf modem port seems as /dev/ttyUSB0 (working port)
according to trial but in modemmanager gui it seems as /dev/ttyUSB1

Working wvdial.conf:

[Dialer 3g]
Init2 = AT+CGDCONT=1,"IP","mgb"
Modem Type = Analog Modem
Baud = 115200
New PPPD = yes
Modem = /dev/ttyUSB0
ISDN = 0
Phone = *99#
Password = internet
Username = internet
Auto DNS =1

[Dialer pin]
Modem = /dev/ttyUSB0
Baud = 115200
Init2 = AT+CGDCONT=1,"IP","mgb"



==================================

nm-tool output:

- Device: ttyUSB1 --------------------------------------------------------------
  Type:              Mobile Broadband (GSM)
  Driver:            option1
  State:             disconnected
  Default:           no

  Capabilities:


=================================



/var/log/syslog output during trying to make connection using network-manager:


Jul 27 15:46:10 ahmetyhp ModemManager[939]: <info>  Modem /org/freedesktop/ModemManager1/Modem/0: state changed (disabled -> enabling)
Jul 27 15:46:10 ahmetyhp NetworkManager[1286]: <info> (ttyUSB1) modem state changed, 'disabled' --> 'enabling' (reason: user-requested)
Jul 27 15:46:10 ahmetyhp ModemManager[939]: <warn>  (ttyUSB1): port attributes not fully set
Jul 27 15:46:11 ahmetyhp ModemManager[939]: <info>  Modem /org/freedesktop/ModemManager1/Modem/0: 3GPP Registration state changed (unknown -> registering)
Jul 27 15:46:11 ahmetyhp ModemManager[939]: <info>  Modem /org/freedesktop/ModemManager1/Modem/0: 3GPP Registration state changed (registering -> home)
Jul 27 15:46:11 ahmetyhp ModemManager[939]: <info>  Modem /org/freedesktop/ModemManager1/Modem/0: 3GPP location updated (MCC: '286', MNC: '1', Location area code: '0', Cell ID: '0')
Jul 27 15:46:11 ahmetyhp ModemManager[939]: <info>  Modem /org/freedesktop/ModemManager1/Modem/0: state changed (enabling -> registered)
Jul 27 15:46:11 ahmetyhp NetworkManager[1286]: <info> (ttyUSB1) modem state changed, 'enabling' --> 'registered' (reason: user-requested)
Jul 27 15:46:11 ahmetyhp NetworkManager[1286]: <info> WWAN now enabled by management service
Jul 27 15:46:11 ahmetyhp ModemManager[939]: <info>  Modem /org/freedesktop/ModemManager1/Modem/0: signal quality updated (40)
Jul 27 15:46:11 ahmetyhp ModemManager[939]: <info>  Modem /org/freedesktop/ModemManager1/Modem/0: access technology changed (unknown -> umts)
Jul 27 15:46:27 ahmetyhp ModemManager[939]: <info>  Modem /org/freedesktop/ModemManager1/Modem/0: signal quality updated (29)
Jul 27 15:46:31 ahmetyhp NetworkManager[1286]: <info> Activation (ttyUSB1) starting connection 'Turkcell'
Jul 27 15:46:31 ahmetyhp NetworkManager[1286]: <info> (ttyUSB1): device state change: disconnected -> prepare (reason 'none') [30 40 0]
Jul 27 15:46:31 ahmetyhp NetworkManager[1286]: <info> NetworkManager state is now CONNECTING
Jul 27 15:46:31 ahmetyhp NetworkManager[1286]: <info> Activation (ttyUSB1) Stage 1 of 5 (Device Prepare) scheduled...
Jul 27 15:46:31 ahmetyhp NetworkManager[1286]: <info> Activation (ttyUSB1) Stage 1 of 5 (Device Prepare) started...
Jul 27 15:46:31 ahmetyhp NetworkManager[1286]: <info> Activation (ttyUSB1) Stage 1 of 5 (Device Prepare) complete.
Jul 27 15:46:31 ahmetyhp ModemManager[939]: <info>  Simple connect started...
Jul 27 15:46:31 ahmetyhp ModemManager[939]: <info>  Simple connect state (4/8): Wait to get fully enabled
Jul 27 15:46:31 ahmetyhp ModemManager[939]: <info>  Simple connect state (5/8): Register
Jul 27 15:46:31 ahmetyhp ModemManager[939]: <info>  Simple connect state (6/8): Bearer
Jul 27 15:46:31 ahmetyhp ModemManager[939]: <info>  Simple connect state (7/8): Connect
Jul 27 15:46:31 ahmetyhp ModemManager[939]: <info>  Modem /org/freedesktop/ModemManager1/Modem/0: state changed (registered -> connecting)
Jul 27 15:46:31 ahmetyhp NetworkManager[1286]: <info> (ttyUSB1) modem state changed, 'registered' --> 'connecting' (reason: user-requested)
Jul 27 15:46:31 ahmetyhp ModemManager[939]: <warn>  (ttyUSB0): port attributes not fully set
Jul 27 15:46:31 ahmetyhp ModemManager[939]: <info>  Modem /org/freedesktop/ModemManager1/Modem/0: state changed (connecting -> connected)
Jul 27 15:46:31 ahmetyhp ModemManager[939]: <info>  Simple connect state (8/8): All done
Jul 27 15:46:31 ahmetyhp NetworkManager[1286]: <info> (ttyUSB1) modem state changed, 'connecting' --> 'connected' (reason: user-requested)
Jul 27 15:46:31 ahmetyhp NetworkManager[1286]: <warn> (ttyUSB0): failed to look up interface index
Jul 27 15:46:31 ahmetyhp NetworkManager[1286]: <info> Activation (ttyUSB1) Stage 2 of 5 (Device Configure) scheduled...
Jul 27 15:46:31 ahmetyhp NetworkManager[1286]: <info> Activation (ttyUSB1) Stage 2 of 5 (Device Configure) starting...
Jul 27 15:46:31 ahmetyhp NetworkManager[1286]: <info> (ttyUSB1): device state change: prepare -> config (reason 'none') [40 50 0]
Jul 27 15:46:31 ahmetyhp NetworkManager[1286]: <info> Activation (ttyUSB1) Stage 2 of 5 (Device Configure) successful.
Jul 27 15:46:31 ahmetyhp NetworkManager[1286]: <info> Activation (ttyUSB1) Stage 3 of 5 (IP Configure Start) scheduled.
Jul 27 15:46:31 ahmetyhp NetworkManager[1286]: <info> Activation (ttyUSB1) Stage 2 of 5 (Device Configure) complete.
Jul 27 15:46:31 ahmetyhp NetworkManager[1286]: <info> Activation (ttyUSB1) Stage 3 of 5 (IP Configure Start) started...
Jul 27 15:46:31 ahmetyhp NetworkManager[1286]: <info> (ttyUSB1): device state change: config -> ip-config (reason 'none') [50 70 0]
Jul 27 15:46:31 ahmetyhp NetworkManager[1286]: <info> using modem-specified IP timeout: 20 seconds
Jul 27 15:46:31 ahmetyhp NetworkManager[1286]: <info> starting PPP connection
Jul 27 15:46:31 ahmetyhp NetworkManager[1286]: <info> pppd started with pid 3325
Jul 27 15:46:31 ahmetyhp NetworkManager[1286]: <info> Activation (ttyUSB1) Stage 4 of 5 (IPv6 Configure Timeout) scheduled...
Jul 27 15:46:31 ahmetyhp NetworkManager[1286]: <info> Activation (ttyUSB1) Stage 3 of 5 (IP Configure Start) complete.
Jul 27 15:46:31 ahmetyhp NetworkManager[1286]: <info> Activation (ttyUSB1) Stage 4 of 5 (IPv6 Configure Timeout) started...
Jul 27 15:46:31 ahmetyhp NetworkManager[1286]: <info> Activation (ttyUSB1) Stage 4 of 5 (IPv6 Configure Timeout) complete.
Jul 27 15:46:31 ahmetyhp pppd[3325]: Plugin /usr/lib/x86_64-linux-gnu/pppd/2.4.5/nm-pppd-plugin.so loaded.
Jul 27 15:46:31 ahmetyhp pppd[3325]: pppd 2.4.5 started by root, uid 0
Jul 27 15:46:31 ahmetyhp pppd[3325]: Using interface ppp0
Jul 27 15:46:31 ahmetyhp pppd[3325]: Connect: ppp0 <--> /dev/ttyUSB0
Jul 27 15:46:31 ahmetyhp NetworkManager[1286]:    SCPlugin-Ifupdown: devices added (path: /sys/devices/virtual/net/ppp0, iface: ppp0)
Jul 27 15:46:31 ahmetyhp NetworkManager[1286]:    SCPlugin-Ifupdown: device added (path: /sys/devices/virtual/net/ppp0, iface: ppp0): no ifupdown configuration found.
Jul 27 15:46:31 ahmetyhp NetworkManager[1286]: <warn> /sys/devices/virtual/net/ppp0: couldn't determine device driver; ignoring...
Jul 27 15:46:31 ahmetyhp pppd[3325]: CHAP authentication succeeded
Jul 27 15:46:31 ahmetyhp pppd[3325]: CHAP authentication succeeded
Jul 27 15:46:33 ahmetyhp pppd[3325]: Modem hangup
Jul 27 15:46:33 ahmetyhp pppd[3325]: Connection terminated.
Jul 27 15:46:33 ahmetyhp NetworkManager[1286]: <info> Activation (ttyUSB1) Stage 4 of 5 (IPv4 Configure Timeout) scheduled...
Jul 27 15:46:33 ahmetyhp NetworkManager[1286]: <info> Activation (ttyUSB1) Stage 4 of 5 (IPv4 Configure Timeout) started...
Jul 27 15:46:33 ahmetyhp NetworkManager[1286]: <info> (ttyUSB1): device state change: ip-config -> failed (reason 'ip-config-unavailable') [70 120 5]
Jul 27 15:46:33 ahmetyhp NetworkManager[1286]: <info> NetworkManager state is now DISCONNECTED
Jul 27 15:46:33 ahmetyhp NetworkManager[1286]: <warn> Activation (ttyUSB1) failed for connection 'Turkcell'
Jul 27 15:46:33 ahmetyhp NetworkManager[1286]: <info> Activation (ttyUSB1) Stage 4 of 5 (IPv4 Configure Timeout) complete.
Jul 27 15:46:33 ahmetyhp NetworkManager[1286]: <info> (ttyUSB1): device state change: failed -> disconnected (reason 'none') [120 30 0]
Jul 27 15:46:33 ahmetyhp NetworkManager[1286]: <info> (ttyUSB1): deactivating device (reason 'none') [0]
Jul 27 15:46:33 ahmetyhp NetworkManager[1286]:    SCPlugin-Ifupdown: devices removed (path: /sys/devices/virtual/net/ppp0, iface: ppp0)
Jul 27 15:46:33 ahmetyhp ModemManager[939]: <info>  Modem /org/freedesktop/ModemManager1/Modem/0: state changed (connected -> disconnecting)
Jul 27 15:46:33 ahmetyhp NetworkManager[1286]: <info> (ttyUSB1) modem state changed, 'connected' --> 'disconnecting' (reason: user-requested)
Jul 27 15:46:34 ahmetyhp pppd[3325]: Exit.
Jul 27 15:46:34 ahmetyhp ModemManager[939]: <warn>  (ttyUSB0): port attributes not fully set
Jul 27 15:46:35 ahmetyhp ModemManager[939]: <info>  Modem /org/freedesktop/ModemManager1/Modem/0: state changed (disconnecting -> registered)
Jul 27 15:46:35 ahmetyhp NetworkManager[1286]: <info> (ttyUSB1) modem state changed, 'disconnecting' --> 'registered' (reason: user-requested)

** Affects: modemmanager (Ubuntu)
     Importance: Undecided
         Status: New

-- 
3G modem e176g issue
https://bugs.launchpad.net/bugs/1349100
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