5G is also a horribly imprecise term - it can include anything from 600 MHz UHF to 40 GHz mm wave, and widely varying modulation and power control schemes. The lower bands are probably not a problem, as we've been using some of them for quite a while, though not on our persons. The mm-wave and THz stuff really is a huge unknown.
One problem is that these technologies don't ever get seriously tested for biological effects: They just get deployed due to industry/govt/carrier/market pressure, and by the time we have enough data to even know therer might be a danger (viz, the GSM study above), we're already experimenting on the population as test subjects for the next generation of risk. At least as much as the frequency, the modulation method seems to matter, too, with the very sharp-edged full-power square waves of TSM/GSM type signals probably being considerably worse than the noise-like CDMA, for instance. (IMO, there is probably no current (4G/5G) LTE technology that is nearly as safe as CDMA.) More recent research does seem to show that there are RF health effects that are NOT related to heating, but heating is the only thing any of the gov't/industry "RF safety" regs cover.
This really is one of those areas where an honest person is forced to recognize that we have no idea what we don't know. RF and biology is a barely studied field, yet we know that many (most? all?) living things do have biophoton systems that we don't understand, and have largely ignored. 5G could be heinously dangerous, or relatively benign. So the answer to your question is no, there isn't (much) solid evidence yet that 5G is dangerous, and we won't really know for many years. But neither is there any actual evidence that it is safe and harmless...
There's questions about the general increase of wireless traffic in general, but nothing has be proven at all since cell phones came about. Let alone microwaves, or household appliances. At least not to my knowledge.
https://www.theverge.com/2020/4/4/21207927/5g-towers-burning...
https://ehtrust.org/science/cell-towers-and-cell-antennae/co...
I don't think it's a simple matter of: non-ionizing radiotion=safe.
https://news.ycombinator.com/item?id=20038570
in general, research on RF radiation can take time to wade through and you might not arrive at a satisfying answer one way or the other.
Not so sure they were. The testing wasn't exactly great and compliance in the real world is... less than realistic.
For folks who must fret over mm wave tech, it's worth considering that cell towers have been using 11-83GHz bands for short distance backhaul & linkage for decades. So have tons of other industries.
Last, I'm about positive that only some approved frequency groups in the 5G standard will be in use, in any given region. Lower bands should see the widest deployment.
So mounting a telco transmitter on your roof is probably bad for you, similar to being inside a microwave oven.
Holding it pressed against your ear while talking is also probably bad for you depending on duration, but mfgs. do tests at various distances from your ear.
If you're a real estate agent using your mobile phone all day, I'd use an earpiece and put the phone on your desk away from your body.