Thanks, that was just what I needed. The phone is at a remote location and I haven't gotten anyone there to get into its setup menu for me, but I connected a different phone to a linux where I am with a newer kernel and saw the same thing - lssub -v only displayed a Mass Storage interface. I fiddled with the phone's settings, got it to display a Communications interface via lsub, udev created /dev/ttyACM0 and it worked with gnokii.
So I told the people at the other location to figure out how to change a phone to have a Communications interface, and to find me a linux with a 2.6 kernel and udev.