4G is on the order of 10^9 Hz (1 GHz), and 5G is on the order of 10^10 - 10^11 Hz. Both are non-ionizing radiation, and in the overall scheme of things, relatively close in frequency.
Ionizing radiation causes cell mutation. It starts with UV radiation at 10^16 Hz. X-rays are around 10^18 Hz.
We can't say with certainty that 5G can't possibly have some negative effects, but so far, we have no reason to believe it.
That's the world's leading authority on human health saying that. I don't care that technically speaking cell phones "can't" cause cancer because they are thought to be non-ionizing.
That's just the same as all the other things in history that have been impossible until they've been done.
https://www.wsj.com/articles/world-health-organization-to-dr...
Most of the increase has come from our increased life expectancy since getting cancer is very strongly linked with age. Lifestyle choices have also contributed. An aging population and greater detection will result in more cancer cases.
Could there be some other mechanism that we don't understand yet and haven't observed yet that could be harmful? Yes, of course. But nobody has been able to provide any evidence yet.
We can't prove it's completely safe, but nobody yet has been able to demonstrate any compelling evidence that it's unsafe.
https://e360.yale.edu/features/insect_numbers_declining_why_...
For this reason it's traditionally considers useless as radio transmission. And turned into a global free frequency span. Making this radio space used by all kinds of devices that you have at home. Wifi, Bluetooth, etc. There is tons of research of how radio and other waves effect the human body.