Mobile communications have undergone a continuous process of technological evolution over the past decades, becoming one of the fundamental infrastructures of modern society. This study presents an analysis of the evolution of cellular mobile networks, from second-generation (2G) digital systems to fifth-generation (5G) networks, highlighting the main technologies, architectures, and applications introduced throughout this process. Initially, the characteristics of 2G networks and their enhancements for data transmission are presented. Subsequently, third-generation networks, which enabled the widespread adoption of mobile Internet access, and fourth-generation networks, which expanded mobile broadband through fully IP-based architectures, are analyzed. The study also discusses the main concepts associated with 5G, including its service-based architecture, the 5G New Radio (5G NR) air interface, Massive MIMO, beamforming, network function virtualization, and Network Slicing. In addition to the technical aspects, the work examines the impact of mobile network evolution across different sectors of society, as well as the perspectives for the continued evolution of telecommunications. The analysis demonstrates that the evolution of mobile communications has been driven by the increasing demand for capacity, connectivity, and service diversity, significantly contributing to the digital transformation observed on a global scale.