I've been using two way radios at a much more dangerous frequencies, right up against my skull, for 58 years. If anything happens to my brain, I'll let you know. It seems to be functioning, though (although I do have my senior moments - but I've earned the right.)
The radiation absorbed from a cellphone isn't ionizing so all it's doing is creating heat - probably enough to measure - with very sensitive instruments - for about an area of your skin about the size of a postage stamp. Stepping out into the noon sunshine in the summer for 10 seconds is far more dangerous than 24 straight hours of a cellphone call - UVB is ionizing to a slight extent.
Your body absorbs electromagnetic radiation all the time, unless you live in a totally dark cave in the middle of nowhere - we evolved to accept that from the time our first amphibian ancestors set foot on dry land. What's important is whether the radiation is ionizing or not - the stuff from cellphones isn't, the stuff outside (from the sun) is. You've heard of sun poisoning, you've never heard of cellphone poisoning. (SAR is just a governmental "we're addressing the problem" response to a lot of Luddite FUD. If you're being seen doing something the idiots are satisfied - even if what you're doing is totally ineffective against a non-problem.)
The number of people who have died of cellphone exposure is probably equal to the number of non-medical-researchers (or terrorists) who died of smallpox last year - about 0.