Comment 1 for bug 1355667

Sounds like a duplicate to bug 1339794 or bug 1321627.

If you have shell access, you could try either of these to get cellular connectivity back:
 - /usr/share/ofono/scripts/online-modem
 - stop urfkill ; edit file /var/lib/urfkill/saved-states and change the [WWAN] soft=true to soft=false ; start urfkill