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Nigeria Communications Commission (NCC) statistics subscribers under the GSM category shows that14.3 millionactive network users have been lost within 10 months as active mobile subscription from 9mobile, MTN, Glo and Airtel crashed from 154.7 million in January to 140.4 million in October, 2017. MTN and 9mobile lost 11,528,125 and 3,400,894 subscribers respectively as Airtel and Globacom gained 422,925 and 190,031, accordingly between January to October. As a result of the deduction of subscribers from 9mobile and MTN base from January to October 2017, MTN and 9mobile lost about 27.32 billion potential voice revenue within the 10 month period under review. The porting activities experienced by telecommunications service providers in October fell to 19,419 from 33,514 recorded in the month of September. In terms of outgoing porting, 9mobile lost 3,088 subscribers to other network providers; MTN lost 2,777 subscribers; Globacom lost 2,409 subscribers; while 1,432 subscribers left Airtel, making a total of 9,706 porting activities.