To link your NIN to an Mtn number, simply dial *785# using the MTN phone number you wish to link, enter your NIN and submit or;
Dial *785#Your NIN# from the MTN phone number you wish to link. The number will be linked to your NIN automatically.
Visit https://mtnonline.com/nim/ using your phone or computer.
Complete the NIN linking form by entering your name, MTN phone number, NIN, and email address.
Submit the form as soon as you’re done.
Wait for feedback from the network.
Dial *121# on the Airtel line you wish to link.
Type 1 for “NIN Capture” and send.
Enter your 11-digit NIN and send.
Wait for the message confirming your submission. If you get an error, just wait for some time and try again.
Glo and 9mobile
For the other networks, you simply visit the nearest office of your service provider (Glo or 9mobile) to register/link your NIN.
Go with NIN and your SIM pack or call the customer care line of your service provider.
9mobile said it is making effort to develop a system that would make things simple for its customers. You can check your NIN status by dialling *346# from your 9mobile line.