I have been listening to the talking heads for the past couple of days about the danger of cell phones, possibly worse than smoking .  Since it is an important issue of today I would like to pass on the critical thing to take away from these warnings.  I have always said, about cell phone usage, that is, if one is holding the phone closely against your head, don't.  Get an earpiece not a Blue tooth! or use the speaker.   The reason is simple, the near EMF (Electro Magnetic Force) of antennae according to Maxwell's laws is strong, and can be explained  in laymans terms:  The strength of an EMF  flux field (the field generated by the emitter (antenna) is inversely proportional to the distance from the source). In other words a changing electrical field creates a changing magenetic field and vice-versa this is how antennas and all over air communications are possible (of course at the speed of light).

When you are very close physically to a cell phone or any transmitter/transciever during conversation the flux (EMF field is very strong) the electro and magneto components of the "signal" are very tight (that is; they effect whatever the medium they are in almost in unison) this is bad for biological cells (us).  As you move "away" the electro and magneto components flux decrease by an proportional inverse factor of distance from the source.  For eg. the difference between being 1 inch and 1 foot is a factor of 1/12 field strength relative to being 1 inch away, if you are two feet away the field strength 1/12 X 1/12 or 1/144 field strength essentially.

This is why I didn't go into high energy communications, you essentially get slow cooked over the years, you don't do the job very long.

Home cordless sets work on lower energy levels and frequencies, not nearly as strong as necessary to reach a cell tower.