This study examines the regulatory landscape and competitive dynamics in the telecommunications industry of five key Latin American countries: Colombia, Peru, Mexico, Brazil, and Chile. Focusing on market concentration analysis and the identification of regulatory policies that may impact market competitiveness, the research aims to contribute insights to the discussion about telecommunications policy in the region. This article encompasses the analysis for both fixed and mobile services for each country in the sample. Using descriptive analysis, I explore potential relationships among the evolution of key variables, offering evidence on the intricate interplay between regulation, competition, and market power in the Latin American telecommunications industry. Preliminary findings reveal a remarkable market concentration in mobile services and a somewhat lower yet significant concentration in fixed services. Quantitative reduced-form evidence supports expected impact of certain regulations on key market indicators across the region.