I can make outgoing GV calls on the Obi100, but no longer receive incoming calls, which are going to GV voicemail. I've replugged the Obi device, checked to make sure it shows normal network operation, installed the Obi update, and checked my Google settings, which had not been changed. What else is there to do?
I guess I should note that I'm sure there are incoming calls I'm missing. I've made numerous test phones with my own cell.