Nigeria’s Ministry of communications says that over 9 million mobile lines are unregistered and has directed that they be blocked. If you are worried about the registration status of your SIM card, you can easilly check right on your phone. Below are the codes you can use to check your SIM card registration status.
Codes to check SIM card registration status for Nigerian mobile networks
MTN – dial *789*1#, or text “REG” to 789
Airtel – dial *746#
9mobile – dial 746 or 200
Glo – text REG to 746 or 3456.