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Presented at the IEEE 5G Summit co-hosted with the Painel Telebrasil 2018, it introduces the discussion on radio spectrum by addressing the cycles of evolution of telecommunications networks and services, the need for 5G, the benefits brought by 5G, as well as its challenges and solutions. It takes an approach on the first radiofrequencies sub-bands used in the 5G, standardized and in the world. Discusses the alternatives for sub-bands below 1 GHz, the importance of millimeter waves and unlicensed spectrum. Finally, it brings the discussion about spectrum sharing as a great mechanism inducing new business and innovation as well as efficient use of spectrum.