
It's also very important to be aware that the FCC's method for conducting these "thermal effects only" tests uses a plastic head filled with a fluid simulating the brain, for short very exposures. This test is used as the basis for all cell phone "safe" exposure limits.
https://spectrum.ieee.org/tech-talk/telecom/wireless/radio-frequency-exposure-test-iphone-11-pro-double-fcc-limits