This book explains what is the fifth generation cellular mobile phone technology, known as 5G. What are the new radio frequency bands you can use. Why does this technology appear on the scene? can it cause harm to your health? What can the mobile technology radio frequencies do to biological matter, what can they do to living tissue? This book shows how investigations are treated to be taken into account in the establishment of protection limits. What are the organizations that establish these limits? What are the protection limits for these Non-Ionizing Radiations (NIR)?It also summarizes the types of studies that have been carried out to establish the parameters mentioned above, such as: epidemiological studies, "in vitro", and "in vivo".