After adding Nokia 2710 phone using BlueDevil, selecting operator and configuring connection params connection appears in applet successfully. But when I try to connect, it fails with message "Disconnected".
It happens in all distributions I've tried. Affects Ubuntu 12.04, Fedora 17, Sabayon 9 and others.
Connections works with SonyEricsson K750i.
In Gnome, using nm-applet, connection works even with Nokia 2710.

Reproducible: Always

Steps to Reproduce:
1. Add Nokia 2710 device in BlueDevil
2. Create PAN/DUN connection
3. Try to connect in kde NM applet
Actual Results:  
Connection is not happening and I get "Disconnected" message. Log messages are put in "Additional Information".

Expected Results:  
Connect to internet using Nokia 2710 phone via bluetooth

Jun 12 16:58:40 kubuntu modem-manager[6039]: <info>  (rfcomm0) opening serial port...
Jun 12 16:58:40 kubuntu kernel: [  569.278695] Bluetooth: TIOCGSERIAL is not supported
Jun 12 16:58:41 kubuntu modem-manager[6039]: <info>  (rfcomm0) closing serial port...
Jun 12 16:58:41 kubuntu modem-manager[6039]: <info>  (rfcomm0) serial port closed
Jun 12 16:58:41 kubuntu modem-manager[6039]: <info>  (rfcomm0) opening serial port...
Jun 12 16:58:41 kubuntu modem-manager[6039]: <info>  (Generic): GSM modem /sys/devices/pci0000:00/0000:00:1d.2/usb7/7-1 claimed port rfcomm0
Jun 12 16:58:41 kubuntu kernel: [  570.112400] Bluetooth: TIOCGSERIAL is not supported
Jun 12 16:58:41 kubuntu modem-manager[6039]: <info>  (rfcomm0) closing serial port...
Jun 12 16:58:41 kubuntu modem-manager[6039]: <info>  (rfcomm0) serial port closed
Jun 12 16:58:41 kubuntu NetworkManager[6041]: <info> ignoring modem 'rfcomm0' (no associated Bluetooth device)
Jun 12 16:59:11 kubuntu NetworkManager[6041]: <warn> (6C:A7:80:7D:2B:0F): failed to look up interface index
Jun 12 16:59:11 kubuntu NetworkManager[6041]: <info> BT device polter (6C:A7:80:7D:2B:0F) added (DUN NAP)
Jun 12 16:59:11 kubuntu NetworkManager[6041]: <info> (6C:A7:80:7D:2B:0F): new Bluetooth device (driver: 'bluez' ifindex: 0)
Jun 12 16:59:11 kubuntu NetworkManager[6041]: <info> (6C:A7:80:7D:2B:0F): exported as /org/freedesktop/NetworkManager/Devices/2
Jun 12 16:59:11 kubuntu NetworkManager[6041]: <info> (6C:A7:80:7D:2B:0F): now managed
Jun 12 16:59:11 kubuntu NetworkManager[6041]: <info> (6C:A7:80:7D:2B:0F): device state change: unmanaged -> unavailable (reason 'managed') [10 20 2]
Jun 12 16:59:11 kubuntu NetworkManager[6041]: <info> (6C:A7:80:7D:2B:0F): deactivating device (reason 'managed') [2]
Jun 12 16:59:11 kubuntu NetworkManager[6041]: nm_system_iface_flush_routes: assertion `ifindex > 0' failed
Jun 12 16:59:11 kubuntu NetworkManager[6041]: nm_system_iface_flush_addresses: assertion `ifindex > 0' failed
Jun 12 16:59:11 kubuntu NetworkManager[6041]: <info> (6C:A7:80:7D:2B:0F): device state change: unavailable -> disconnected (reason 'none') [20 30 0]
Jun 12 16:59:11 kubuntu modem-manager[6039]: <info>  (tty/rfcomm0): released by modem /sys/devices/pci0000:00/0000:00:1d.2/usb7/7-1
Jun 12 16:59:12 kubuntu NetworkManager[6041]:    keyfile: updating /etc/NetworkManager/system-connections/polter Tele2
Jun 12 16:59:32 kubuntu NetworkManager[6041]: <info> Activation (6C:A7:80:7D:2B:0F) starting connection 'polter Tele2'
Jun 12 16:59:32 kubuntu NetworkManager[6041]: <info> (6C:A7:80:7D:2B:0F): device state change: disconnected -> prepare (reason 'none') [30 40 0]
Jun 12 16:59:32 kubuntu NetworkManager[6041]: <info> Activation (6C:A7:80:7D:2B:0F) Stage 1 of 5 (Device Prepare) scheduled...
Jun 12 16:59:32 kubuntu NetworkManager[6041]: <info> Activation (6C:A7:80:7D:2B:0F) Stage 1 of 5 (Device Prepare) started...
Jun 12 16:59:32 kubuntu NetworkManager[6041]: <info> Activation (6C:A7:80:7D:2B:0F) Stage 2 of 5 (Device Configure) scheduled...
Jun 12 16:59:32 kubuntu NetworkManager[6041]: <info> Activation (6C:A7:80:7D:2B:0F) Stage 1 of 5 (Device Prepare) complete.
Jun 12 16:59:32 kubuntu NetworkManager[6041]: <info> Activation (6C:A7:80:7D:2B:0F) Stage 2 of 5 (Device Configure) starting...
Jun 12 16:59:32 kubuntu NetworkManager[6041]: <info> (6C:A7:80:7D:2B:0F): device state change: prepare -> config (reason 'none') [40 50 0]
Jun 12 16:59:32 kubuntu NetworkManager[6041]: <info> Activation (6C:A7:80:7D:2B:0F) Stage 2 of 5 (Device Configure) complete.
Jun 12 16:59:32 kubuntu NetworkManager[6041]: <info> Activation (6C:A7:80:7D:2B:0F 6C:A7:80:7D:2B:0F/bluetooth) Stage 2 of 5 (Device Configure) successful.  Will connect via DUN.
Jun 12 16:59:32 kubuntu NetworkManager[6041]: <info> Activation (6C:A7:80:7D:2B:0F/bluetooth) Stage 2 of 5 (Device Configure) waiting for modem to appear.
Jun 12 16:59:32 kubuntu modem-manager[6039]: <info>  (rfcomm0) opening serial port...
Jun 12 16:59:32 kubuntu kernel: [  621.918130] Bluetooth: TIOCGSERIAL is not supported
Jun 12 16:59:33 kubuntu modem-manager[6039]: <info>  (rfcomm0) closing serial port...
Jun 12 16:59:33 kubuntu modem-manager[6039]: <info>  (rfcomm0) serial port closed
Jun 12 16:59:33 kubuntu modem-manager[6039]: <info>  (rfcomm0) opening serial port...
Jun 12 16:59:33 kubuntu modem-manager[6039]: <info>  (Generic): GSM modem /sys/devices/pci0000:00/0000:00:1d.2/usb7/7-1 claimed port rfcomm0
Jun 12 16:59:33 kubuntu kernel: [  622.751148] Bluetooth: TIOCGSERIAL is not supported
Jun 12 16:59:34 kubuntu modem-manager[6039]: <info>  (rfcomm0) closing serial port...
Jun 12 16:59:34 kubuntu modem-manager[6039]: <info>  (rfcomm0) serial port closed
Jun 12 16:59:34 kubuntu NetworkManager[6041]: <info> Activation (6C:A7:80:7D:2B:0F/bluetooth) Stage 2 of 5 (Device Configure) modem found.
Jun 12 16:59:34 kubuntu modem-manager[6039]: <info>  (rfcomm0) opening serial port...
Jun 12 16:59:34 kubuntu modem-manager[6039]: <info>  Modem /org/freedesktop/ModemManager/Modems/1: state changed (disabled -> enabling)
Jun 12 16:59:34 kubuntu kernel: [  623.046273] Bluetooth: TIOCGSERIAL is not supported
Jun 12 16:59:34 kubuntu modem-manager[6039]: <info>  Modem /org/freedesktop/ModemManager/Modems/1: state changed (enabling -> disabled)
Jun 12 16:59:34 kubuntu modem-manager[6039]: <info>  (rfcomm0) closing serial port...
Jun 12 16:59:34 kubuntu modem-manager[6039]: <info>  (rfcomm0) serial port closed
Jun 12 16:59:34 kubuntu NetworkManager[6041]: <warn> GSM modem enable failed: (32) Unknown error
Jun 12 16:59:34 kubuntu NetworkManager[6041]: <info> (6C:A7:80:7D:2B:0F): device state change: config -> failed (reason 'modem-init-failed') [50 120 28]
Jun 12 16:59:34 kubuntu NetworkManager[6041]: <warn> Activation (6C:A7:80:7D:2B:0F) failed.
Jun 12 16:59:34 kubuntu NetworkManager[6041]: <info> (6C:A7:80:7D:2B:0F): device state change: failed -> disconnected (reason 'none') [120 30 0]
Jun 12 16:59:34 kubuntu NetworkManager[6041]: <info> (6C:A7:80:7D:2B:0F): deactivating device (reason 'none') [0]
Jun 12 16:59:34 kubuntu NetworkManager[6041]: nm_system_iface_flush_routes: assertion `ifindex > 0' failed
Jun 12 16:59:34 kubuntu NetworkManager[6041]: nm_system_iface_flush_addresses: assertion `ifindex > 0' failed
Jun 12 16:59:34 kubuntu NetworkManager[6041]: <info> Policy set 'Wired connection 1' (eth0) as default for IPv4 routing and DNS.
Jun 12 16:59:34 kubuntu NetworkManager[6041]: <info> Policy set 'Wired connection 1' (eth0) as default for IPv4 routing and DNS.
Jun 12 16:59:34 kubuntu modem-manager[6039]: <info>  (tty/rfcomm0): released by modem /sys/devices/pci0000:00/0000:00:1d.2/usb7/7-1