After some fussing I’ve finally got Vodafone’s USB Mobile Connect working on Ubuntu! The first stage was easy, installing Vodafone’s experimental Linux drivers, but after that I ran into problems. Checking the debug logs showed me the modem was working OK (and the SIM was working as it could receive and send SMS through the GUI) but wvdial was failing. I’ve now managed to get wvdial configured correctly, so it’s now a case of working out where Vodafone’s GUI is getting its config from. I’ll try to remember to post a full summary of the solution when I have the GUI up and running.