Earlier quoted context omitted.
Part of the problem with this idea is that your cell phone exposes your brain to trivial quantities of EM radiation in both absolute and relative terms. If EM in that spectrum had any kind of effect, we'd have seen it long since in people that live near radio masts, people that work with radar units and radio transmitters (military, mostly), people that sleep next to their wifi modems, people working in electrical ge…
Again, you miss the point. The certainty with which you make these statements is the exact same certainty that scientists 50 or 100 years ago used to justify doing all kinds of shit we now know caused unforeseen harm. Don't focus on the one example I gave, focus on that fact that we continually mess with stuff we don't understand, with consequences we can't comprehend. Then 50 years later we just say "we know better…
Of course, I doubt that any of that went through your head. You just pointed at something that caught your attention, completely failing to consider all of the other things that are likely similarly dangerous like aluminum cans, pickled vegetables, soap, clothing, light bulbs, the English language, and so on and so forth. All of those are just as potentially dangerous as cell phones.
I think that you would be well served by studying epistemology, philosophy of science, and rational utilitarianism. I believe that you will find some ideas that will be useful to to you in the future.