If you receive this message it means that the SIM card couldn't register on the network it was assigned to. Try to pull it out then put it back and try again. If the error persists, it means the SIM card is deactivated. In this case, you need to contact the network carrier from where you acquired it.
If you receive this message it means that the SIM card couldn't register on the network it was assigned to. Try to pull it out then put it back and try again. If the error persists, it means the SIM card is deactivated. In this case, you need to contact the network carrier from where you acquired it.