About a Dilemma in the Telecommunications Sector: Virtual Operators or Low-cost Operators?. Periodicals of Engineering and Natural Sciences, [S. l.], v. 7, n. 1, 2019. DOI: 10.21533/pen.v7.i1.1521. Disponível em: https://pen.ius.edu.ba/index.php/pen/article/view/1521. Acesso em: 13 jun. 2026.