From last night, an alarm 'Sim not provisioned' just poped up and still my sim is not working. I rebooted many times but it was usless. Can you help this out? Please send me a personal message
Turn the phone off, take out the SIM and put it back in then power up the phone.
If you still have the problem and you have access to another phone then I would suggest to try your SIM in another phone if the problem is still there then it's most likely you have a bad SIM and will need to get it replaced.