There is a physical issue with your Sim card reading: Sim may have been slightly dislodged if you accidentally dropped or subjected your mobile to vibration: in most case, just remove the battery AND Sim for a few minutes and carefully re-install both Sim (make sure it fits squarely in the socket/cradle) and Battery and Cover. It should reset the phone.
Hope it helps!
This error message sometimes happen when the original phone of the customer was damaged and needs replacement. upon doing the swapping of the phone ; error message appears. sim is locked with the original phone. customer needs to purchase a new sim and use it to the device. they need to contact customer care to update the phone informations.
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