Need wwan gnome-settings-daemon plugin
- brings up the modem (e.g. pops up the sim card dialog via gcr)
- allows applications via a simple API to find out if the modem is ready (and if not initiate that)
Similar code used to live in nm-applet but that's (AFAIK) not used anymore in GMOME3. This will have interactions with #38 so parts might life in g-s-d.