Why Does My Mobile Say Unregistered SIM?

Answer

Your mobile says unregistered sim because your sim card is expired. This may also happen if you are in a low signal area or if your phone does not have enough power charge. Turn it off for 60 seconds and back on to see if it connects properly.
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Sometimes, the SIM card slips out. Take it out and slide it back in. It usually works again.
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The error message "SIM card registration failed" indicates that the phone is having trouble reading the electronic information encoded on the SIM card. ...
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