I'm not aware of any evidence that 5G (of either the cell phone or WiFi type) causes COVID-19, nor any reason to think it could. But there are a bunch of people with serious scientific and engineering qualifications who assert that there is evidence for wireless signals damaging human health. This needs considering:
https://www.5gspaceappeal.org/the-appeal
Some other people will academic qualifications who have spoken publicly about their concerns about 5G radiation;
* Professor Dariusz Leszczynski (PhD, DSc)
https://researchportal.helsinki.fi/en/persons/dariusz-leszczynski
* Dr Mary Redmayne (PhD)
https://research.monash.edu/en/persons/mary-redmayne
Of course that doesn't means they're right. It just means the evidence they discuss is more likely to be worth checking out than blogs by random cranks on the net, like me ;)
Leszczyński doesn't say there's any evidence of any harm, what he says there's not enough evidence of safety and calls for precautionary approach. To be honest, I don't see any scientific value in such research and it kind of goes against the very concept of research *and* even precautionary principle, which itself is rather pseudo-scientific. If there's no biological way 5G could be harmful, and there's no observed harm, then endless beating around the bush doesn't make any sense.
