When you see clips of famous performers collapsing on stage like Lady Gaga for instance.
Or Katy Perry.
Some people actually get sick from the signals broadcasting from their Smart Devices. When you have a stadium or theatre full of people using Smart Devices to film every second to Instagram or Snapchat or YouTube or whatever, then you have hundreds, possibly thousands of phones radiating the audience and the performers on the stage.
Here's a good example of Mass 4G Radiation at it's best, every Smart Device in this stadium is PINGING a tower, wherever the closest towers are, they will PING straight back, and they do this every second. Pity the souls who happen to be caught in the crossfire of this 4G PING battle.