Until the fix is released...
After running into this problem the following steps got my phone back up and running (Nexus 4, r214):
1) Open the terminal app on the phone and validate using password if configured
2) $ sudo stop urfkill
3) $ sudo rm /var/lib/urfkill/saved-states -rf
4) $ sudo reboot
The phone should come back up with the carrier re-enabled.
Until the fix is released...
After running into this problem the following steps got my phone back up and running (Nexus 4, r214):
1) Open the terminal app on the phone and validate using password if configured
2) $ sudo stop urfkill
3) $ sudo rm /var/lib/ urfkill/ saved-states -rf
4) $ sudo reboot
The phone should come back up with the carrier re-enabled.