I think cell phones have been around long enough where we would be, at least seeing the beginning of any negative issues of their use
How many cellphones are there in the world ? 500 million maybe ? So where is all the brain damage ? Apparently it only affects lawyers.
2 watts of 900 MHz – 2100 MHz RF
I just looked up my cell phone on the FCC database. IHDT56FY1
Maximum ERP is 29.4 dBm at the antenna connection at 836 MHz.
Maximum ERP is 29.5 at 1850 MHz.
So maximum effective radiated power is about 1 watt. Now even if we put the phone up against our head and assumed that our head did not change the radiation pattern, less than 1/2 watt could go into our head. Can 1/2 watt make a detectable change in temperature of the tissue or fluids ? I honestly do not know. And I have tried to understand all that "SAR" stuff, but still do not. (SAR = "specific absorption rate") What is the "skin depth" of 850 MHz and 1900 MHz? I expect that some of the highly educated readers of RFcafe will be able to tell me.
I ask this, because one of my favorite professors in college, and chairman of my thesis committee was K5AAK, Dr. Jefferson Lindsey III. He told us of working on the antenna for the backpack that astronauts wore on the moon. The RF link from the backpacks to the lunar lander was 297 MHz (as close as I remember). They determined that a LIVE human head absorbed 297 MHz. (They were surprised to discover that this was not the case when testing with cadavers.) It was too late to change the frequency. So off they went to the moon with a cardiod radiation pattern. (The null being the direction the astronaut was facing). From this I infer that 300 MHz would be a risk to humans, not 1900 MHz.
But still.... where are all the people damaged by cellphones. We have 10s of millions of people using them for long periods every day and we have many years of 'exposure'.
RE: Low frequency fields
See the book
"Possible Health Effects of Exposure to Residential Electric and Magnetic Fields"
published by the National Research Council (National Academy Press 1997) ISBN 0-309-05447-8 .
There is precisely ONE effect from athermal non-ionizing radiation; it causes broken bones to heal faster.
I am amazed how many people quote some seriously flawed 'research'. The most prevalent quotation of crap is a research project where an idiot subject rats to 35 millwatt per square centimeter of microwave radiation. He pulsed the radiation at 15 Hz. His moronic conclusion is that 15 Hz (low frequency radiation) is harmful. How anyone would quote a guy that thinks 2450 MHz is "low frequency" is beyond me. Also, this power level was enough to actually change the body temperature of the rats. Thus this is not even in the category of 'athermal radiation'.
I am also amazed at how many people think that microwave ovens are dangerous. Well, if you mess up your door 'seal', I would call it dangerous also. But they seem to think that 12 cm radiation causes cancer. Hmmm.. they feel perfectly safe cooking their food in an electric oven. And many people love to 'broil'. Well.. 'broiling' is pretty much cooking with wavelengths of a micron through hundreds of microns. (Note to many people that were educated in the USA, a micron is 1/1000 of a millimeter, it is not in anyway related to that freaky unit of measurement that is called an inch.)
We all see what sunlight does to everything it hits. So much 200 nanometer and shorter radiation .....
Seems to me that cooking with 12cm electromagnetic waves would be a heck of a lot safer than cooking with 1 micron waves.