Comment 9 for bug 267227

I've installed 8.10 beta today and I'm also trying to get connected with my V3xx.

My phone has not been dedected by NM, so I've created the 10-modem.fdi as posted above. Now NM dedects my phone after pluggin it in. At the configuration I've selected my provider (Austria/Drei), so far everything seems to work.
But if I try to initialize the connection through my phone (by clicking "Drei"), NM tries to connect for about a half second, and falls back to the "disconnected" state without a error message.

syslog says "No carrier", but my phone shows a good 3G connection:
Oct 4 14:04:29 xps NetworkManager: <info> Registered on Home network
Oct 4 14:04:30 xps NetworkManager: <info> Associated with network: +COPS: 0,0,"3 AT"
Oct 4 14:04:30 xps NetworkManager: <WARN> dial_done(): No carrier
Oct 4 14:04:30 xps NetworkManager: <info> (ttyACM0): device state change: 4 -> 9
Oct 4 14:04:30 xps NetworkManager: <debug> [1223121870.109800] nm_serial_device_close(): Closing device 'ttyACM0'
Oct 4 14:04:30 xps NetworkManager: <info> Marking connection 'Drei' invalid.
Oct 4 14:04:30 xps NetworkManager: <info> Activation (ttyACM0) failed.