Do we know unequivocally that cell phone radiation never has the same effect as ionizing radiation, or that none whatsoever is produced? What if, just for example, while the average particle/wave is in the radio frequencies, there was some minuscule far-UV or Xray spectral components?

Certainly by first principals of what we know, cell phone radiation should be harmless. But there's always the possibility we don't know something important yet, and given cellular radio's omnipresence, I figure it's worth humoring that possibility.

As for power output, I'm not a modem engineer but it sounds like GSM -> 3G -> 4G has progressively reduced power requirements by improving SNR & playing other tricks. Whereas with 5G, on the surface it sounds like the plan to increase bandwidth & performance is "take 4G and jack the frequency & power", so it's kind of the other direction and then makes sense why so many people are asking questions compared to the rollout of 3G or 4G.