It was unlocked and updated to 4.01 when I got it and it has worked OK with GiffGaff.
The GiffGaff SIM is OK in another phone and I have a good signal. Other SIMs in the G300 give the same locked in emergency mode screen.
I have tried several re-starts and toggling airplain mode as suggested in some old threads on this topic but its still stuck. Nothing I do will get it out of this mode.
Powering up and going to the CWM diagnostic screens (via Volume UP & Power On) I did a full Backup. I then did a Clear Data and Reset Factory Defaults. The phone then came up in its correct Android reset state and I could use the default system apps. All seemed to be working OK.
I then did a Restore (of the earlier in the day image). When the Restore finished I did a Restart. I am now back to the "Emergency Calls Only" state and I can't get into Android do anything else. Clearly there is something in the Restored state which jams the phone up. I dont know what to do !
I have found some old threads on this jammed up state but have found no solution.
Any help would be appreciated. I can start re-loading all the extra Apps from Factory state but dont want to go through the long process to have the phone lock up on me again ! HELP !