MTN Group has earmarked investment of over USD3 billion for the upgrade and expansion of its Nigerian business over the next three years, in a bid to improve the quality of its services amid rapid subscriber growth, Business Day reports. The Nigerian market is South Africa-based MTN’s largest by revenues and subscribers, but the company has been penalised by the Nigerian Communications Commission (NCC) for failing to meet minimum standards of service quality, while it also faces attacks on its infrastructure in the north by militant Islamist group Boko Haram. MTN Group CEO Sifiso Dabengwa acknowledged that the firm has challenges with quality of service driven by the ‘high demand’ in Nigeria, adding that the company will ‘continue to invest at this rate in the medium term, and make sure the overall quality of service is acceptable’. At 31 March 2014 MTN Nigeria’s subscriber total stood at 57.2 million, up 12% from 51.3 million twelve months earlier and making it the market leader by some margin. The cellco expects its customer base to exceed 60 million by the end of the year.