Olawuyi, Oluseye M., and OluwasanjoJ. Olawuyi. 2018. “SIM CARDS FUNCTIONS AND POSITIVE IMPACT ON NIGERIAN ECONOMY”. International Journal of Novel Research in Humanities, Social Science and Management 1 (1). https://publications.oasisinternationaljournal.org/index.php/Ijnhssm/article/view/23.