Can it? From what I've read it will only raise the temperature of the skin and skull by a fraction of a degree, far less than that absorbed from sunlight. The brain is very sensitive to temperature changes and even a bit more than a couple degrees above normal would be very noticeable damage wise - so if your brain cells were being fried the effects would be very visible.

Note too that exercise also raises brain temp but your brain is quite able to regulate its temperature under normal conditions (e.g. no certain drugs or overly hot).

http://en.wikipedia.org/wiki/Mobile_phone_radiation_and_heal...