NCC has decided that all telecom providers should block any sim that isn't connected to NIN starting from 30th December 2020.

They initially stopped the sale of new sim cards and I believe the reason for these acts is to curb scam rate in the country

NCC also orders telecom operators to ask users to provide submit their National Identification number within two weeks to avoid sim block.
This was the resolution reached at a meeting between the minister of communication and digital economy and stakeholders in the communication industry on Monday.

This order from NCC applies to MTN, Airtel, 9mobile, and Glo which are the main telecom networks in Nigeria.

In summary, go and complete your sim registration with you NIN as soon as possible.

According to the spokesperson of the Nigeria Communication Commission (NCC) in a statement on Tuesday.

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https://www.newstractor.com.ng/ncc-orders-mtn-airtel-others-to-block-lines-without-nin-274