Before the misguided hysteria around 5G begins, please allow an old science educator to reteach a lesson many seem to have slept through.
The electromagnetic spectrum ranges in energy from low (AM/FM radio) to high (plutonium). The high energy portion includes ionizing radiation that can enter and change cell structure. Ionization is the process by which an atom or a molecule acquires a negative or positive charge by gaining or losing electrons due to sufficiently energetic charged particles or radiant energy traveling through gases, liquids, or solids.
Like everything else this change depends on dosage and duration and the energy of the ionizing particle. Sitting too long in the sun, constant X-ray exposure and handling plutonium directly will give one firsthand evidence of the changes due to ionization.
5G is a non-ionizing radiation. It cannot enter the cell structure and alter it. 5G energy has less energy than that produced by visible light or a microwave oven. This low level of energy makes it benign if not outright safe. A simple analogy would be having a ping pong ball strike you in the head at 10 km/h (non-ionizing) as compared to a golf ball striking you at 100 km/h (ionizing).