Comment 10 for bug 1355218

You've actually hit two different bugs here.

I've marked this as a duplicate of the toggling flight-mode leaves the modem in a bad state.

After doing this a bunch of times, you then hit bug #1321627 which is where the saved-states file ends up with WWAN soft=true, which means urfkill won't try to power on the modem. There are instructions in that bug on how to resolve ( stop urfkill, edit the file ), reboot.

If this doesn't bring up the modem, feel free to re-open this.

I'm also adding a network-indicator task, as it shouldn't be showing "No SIM" when the modem is offline, it should show "offline".