Following NCC instructions just like the rest MTN Nigeria has decided to make this simple for its customers, MTN customers can now link there NIN with there SIM online without any stress follow the below steps to link your NIN (national identification number) with your MTN number

Requirements:
.MTN Number
.FULL NAME
.NIN NUMBER
.EMAIL ADDRESS

Note:
You must have Gotten your national identification number from the NCC office

Follow steps to link up now

1. Visit the link below

CUSTOMER NIN CAPTURE
https://mtnonline.com/nim/

2.Fill In your MTN number

3. Fill In your NIN Number

4.Fill In Your email number


Finally summit it is very simple please do fast to prevent your SIM from getting blocked

SOURCE:
https://techoragon.com/threads/link-your-nin-to-your-mtn-number-online-full-steps.337/

ok....

hmmm just submitted