Akbar, Muhammad Asif, Yasir Ali Soomro, and Sherbaz Khan. “Analytical Study of Reducing Brand Switching (Number Portablity) In GSM Sector”. JISR management and social sciences & economics 15, no. 2 (December 31, 2017): 31–46. Accessed November 22, 2024. https://jisrmsse.szabist.edu.pk/index.php/szabist/article/view/119.