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When connecting IPWireless 4G from T-Mobile (available all over the Europe, not sure about T-Mobile US) I get this in dmesg:
ipw ttyUSB0: IPWireless converter converter now disconnected from ttyUSB0
ipwtty 5-2:1.0: device disconnected
usb 5-2: new full speed USB device using uhci_hcd and address 3
usb 5-2: New USB device found, idVendor=0bc3, idProduct=0001
usb 5-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
usb 5-2: Product: IPWireless Modem
usb 5-2: Manufacturer: IPWireless, Inc.
usb 5-2: SerialNumber: 352146020199498
usb 5-2: configuration #1 chosen from 2 choices
ipwtty 5-2:1.0: IPWireless converter converter detected
usb 5-2: IPWireless converter converter now attached to ttyUSB0
It shows up in lsusb (see attached), however it never shows up in the NetworkManager menu. Also attaching /var/log/messages. Interesting section of the log seems to be IMHO this:
Jul 29 13:12:22 blecha modem-manager: (ttyUSB0) opening serial device...
Jul 29 13:12:29 blecha modem-manager: (ttyUSB0) closing serial device...
Jul 29 13:12:29 blecha modem-manager: (ttyUSB0) opening serial device...
Jul 29 13:12:29 blecha modem-manager: (Generic): GSM modem /sys/devices/pci0000:00/0000:00:1d.0/usb5/5-2 claimed port ttyUSB0
Jul 29 13:12:29 blecha NetworkManager[1459]: <warn> (ttyUSB0): failed to look up interface index
Jul 29 13:12:29 blecha NetworkManager[1459]: <info> (ttyUSB0): new GSM device (driver: 'ipw' ifindex: -1)
Jul 29 13:12:29 blecha NetworkManager[1459]: <info> (ttyUSB0): exported as /org/freedesktop/NetworkManager/Devices/6
Jul 29 13:12:29 blecha NetworkManager[1459]: <info> (ttyUSB0): now managed
Jul 29 13:12:29 blecha NetworkManager[1459]: <info> (ttyUSB0): device state change: 1 -> 2 (reason 2)
Jul 29 13:12:29 blecha NetworkManager[1459]: <info> (ttyUSB0): deactivating device (reason: 2).
Jul 29 13:12:29 blecha modem-manager: Modem /org/freedesktop/ModemManager/Modems/4: Equipment identifier set (+CGSN: 352146020199498)
Jul 29 13:12:29 blecha modem-manager: (ttyUSB0) closing serial device...
Jul 29 13:12:29 blecha NetworkManager[1459]: <info> (ttyUSB0): device state change: 2 -> 3 (reason 0)
What does “failed to look up interface index” mean?
See also bug 450080 which has a lot of comments and some investigation by jklimes into the command set these devices use. I closed it wontfix because i didn't have time for it then but we can reopen it if you like.