The new networks are expected to enable the steering of driverless cars and doctors to perform complex surgeries remotely. They could power connected appliances in the so-called Internet of Things, and virtual and augmented reality. Towers would beam high-speed internet to devices, reducing reliance on cables and Wi-Fi.
https://www.wsj.com/articles/the-5g-race-china-and-u-s-battle-to-control-worlds-fastest-wireless-internet-1536516373
Even higher frequency microwaves, just what your ear doesn't want next to it.
Read the small print in your phones t's and c's, they ALL recommend holding the phone at least 5mm away from ear and not being on for too long, because the research shows that it does heat up soft tissue, unsurprisingly, and more use equates to more heating.
Thinking of dumping my phone and getting a pager or some other alternative (i don't use phones much).