“Role of Value-Added Services in Enhancing Customer Satisfaction in Telecom Companies”. Journal of Informatics Education and Research, [S. l.], v. 6, n. 2, 2026. DOI: 10.52783/wkk2a733. Disponível em: https://jier.org/index.php/journal/article/view/4600. Acesso em: 22 apr. 2026.