What effects can mobile phones have on body tissues?

The potential effects of
mobile phone-associated electromagnetic radiation on tissues include "thermal"
and "non-thermal". Thermal effects are due to tissues being heated by rotations
of molecules induced by the electromagnetic field. In the case of a cell phone, the
head/ear surfaces close to the phone may be induced to heat. This heating has
been thought to cause molecules within cells called "heat-shock proteins" to
become activated and repeated activation of such proteins by
microwaves/electromagnetic radiation can lead to cellular events culminating in
cancerous transformation of the cell (C. Jolly & R.I. Morimoto, "Role of heatshock
response and molecular chaperones in oncogenesis and cell death";
Journal of the National Cancer Institute (2000) Volume 92; pages 1564-1761).
Non-thermal effects are due to low-frequency (but long-term) "pulsing" of the
carrier signal. Non-thermal effects from microwaves similar to those generated by
mobile phones have been implicated in genetic (DNA) molecule damage.