Non industry biologists recommend exposure to no more than 1 milliwatt/m squared. Watch as my phone emits a pulse of 155 milliwatts/m squared when the 4G data is on.
I have seen my phone transmit 1,862 milliwatts/m squared as it struggled to reach a distant cell tower.
The current generation of phones, although they emit less power than previous phones generate a pulsed signal and that is where the concern lies. Not in the intensity necessarily but in the complexity of the signal.
Refer to this video to see what EMF exposure does do our blood - https://www.youtube.com/watch?v=L7E36zGHxRw