Well, probably they put these things in, so in case anything ever goes wrong they can say "we warned you".
Basically, its just microwaves, same stuff that powers your microwave oven, just several thousand times less powerful. As guys from Brainiac tested - even a 100 mobiles ringing at same time are not enough to cook an egg.
So... As Dave pointed out - if you don't have it strapped to your ear, and you are not talking all the time - its perfectly ok.
So, bottom line is - as long as you use it normally, you have nothing to really worry about. Breathing air in a large city probably does more harm.
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