I've detected the problem, I think: even though I have set up Google Voice SMS Alerts (following the instructions at this URL: http://notifo.com/user/gvsms), my Notifications page (at http://notifo.com/user) shows "No notifications." Under that, I read: "You haven't received any notifications yet. Get started by subscribing to some services or browse the setup guide." I then click on "subscribing to some services" and go through the setup process again. Still nothing works!