With regards to the admonition of the Federal Government, that all Nigerians should link their NIN to their SIM cards, some lines that did not comply with this mandate got barred.
Here is how to link your NIN to your MTN:
To get your
NIN, tap *346# from the number linked with our voter’s card, BVN registration, or driver’s license.
Through MTN-NIM portal
This requires your First Name, Middle Name, Last Name, Email address, and National Identity Number to make use of an MTN online portal to link your phone number using your NIN.
a) Go to the registration link, https://mtnonline.com/nim with your browser.
b) Fill up the requirements you can see above.
c) Tap on the submit button.
d) You will receive an OTP in your MTN line.
e) Input the OTP and tap confirm.
Link to your MTN using the USSD code
You can link your MTN line with a USSD code by dialing this *785*NIN#, and it will get submitted to MTN.