When connecting to t-mobile with a huawei e220 usb gsm modem, i see an error message in syslog Nov 6 12:01:54 intel NetworkManager[3269]: <info> (ttyUSB0): device state change: disconnected -> prepare (reason 'none') [30 40 0] Nov 6 12:01:54 intel NetworkManager[3269]: <info> Unmanaged Device found; state CONNECTED forced. (see <a href="http://bugs.launchpad.net/bugs/191889">http://bugs.launchpad.net/bugs/191889</a>) Nov 6 12:01:54 intel NetworkManager[3269]: <info> Unmanaged Device found; state CONNECTED forced. (see <a href="http://bugs.launchpad.net/bugs/191889">http://bugs.launchpad.net/bugs/191889</a>) Nov 6 12:01:54 intel NetworkManager[3269]: <info> Activation (ttyUSB0) Stage 1 of 5 (Device Prepare) scheduled... Nov 6 12:01:54 intel NetworkManager[3269]: <info> Activation (ttyUSB0) Stage 1 of 5 (Device Prepare) started... Nov 6 12:01:54 intel NetworkManager[3269]: <info> Activation (ttyUSB0) Stage 1 of 5 (Device Prepare) complete. Nov 6 12:01:54 intel modem-manager[2742]: <info> (ttyUSB0) opening serial port... Nov 6 12:01:54 intel modem-manager[2742]: <info> Modem /org/freedesktop/ModemManager/Modems/0: state changed (disabled -> enabling) Nov 6 12:01:55 intel modem-manager[2742]: <info> (ttyUSB1) opening serial port... Nov 6 12:01:55 intel modem-manager[2742]: Invalid error code: 303 Nov 6 12:01:55 intel modem-manager[2742]: <info> Modem /org/freedesktop/ModemManager/Modems/0: state changed (enabling -> enabled) Nov 6 12:01:55 intel NetworkManager[3269]: <info> WWAN now enabled by management service Nov 6 12:01:55 intel modem-manager[2742]: <info> Modem /org/freedesktop/ModemManager/Modems/0: state changed (enabled -> registered) Nov 6 12:02:34 intel NetworkManager[3269]: <warn> GSM connection failed: (32) Serial command timed out Same Modem ist working with 11.04, but not with 11.10