Invisible things have sizes too. Do you realize how big Bluetooth waves are? EMF can damage your cells if the wave is smaller than a cell. That is why UV, xrays, and gamma rays are dangerous. Those are all shorter than visible light. Longer than visible light is heat, longer than that is RF. That is why the only functioning EMF weapon is a heat ray at a frequency and power far above any communications device.

If you have a well done study that shows otherwise I'd love to see it. Basic home experiment that proves my side. Put a live ant in a microwave (with some food or water for reasons) the ant is unaffected because the waves used by microwaves are longer than ants bodies.