MTN Nigeria Communications PLC became the first telecommunications operator in Africa to exceed 100 million subscribers.
The company added 2.22 million active users during the month of July.
Total subscriptions reached 100.86 million, rising from 98.64 million recorded in June.
The Nigerian Communications Commission (NCC) released these latest industry figures.
MTN now maintains a dominant 51.7% share of all active mobile subscriptions in Nigeria.
Total active mobile subscriptions across the country increased to 195.11 million in July.
The market is showing recovery following a decline caused by the National Identification Number and Subscriber Identification Module (NIN-SIM) linkage policy.