I have a brother-in-law who has an artificial heart in the sense that
he has some electronic apparatus where his heart used to be.  Anyway I
had to visit my sister recently to discuss some family legal matters,
and I was told not to bring a mobile phone, as this would cause the
artificial heart to malfunction, according to medical opinion she
received.  Anyway, I just switched the mobile off, and kept it out of
sight.  I was told later that my sister did not have a mobile phone,
either kept in the car or anywhere else, and I wonder if that is really
necessary.

I sometimes have an am/fm radio receiver in my pocket in close
proximity to the mobile phone, and I often hear static in the ear plugs
resulting from the provider signal tuning into the mobile phone, so it
could be possible for a mobile phone signal to cause a complicated
electrical heart to malfunction.  Once I happened to put the mobile in
the same pocket as the radio receiver, and there was ear-shattering
static (which sometimes happens anyway if you sit next to someone
receiving a call on a mobile, if you have radio earplugs on), so it is
necessary to keep the mobile separate from the radio, in order to
receive just mild static.

Anyway I would like to look into this matter further, in order to
determine whether mobile phones are in any real sense a threat to
people with artificial hearts.  In the meantime I wonder if anyone
posting in this forum has any thoughts on the matter.  I would have
thought that the new digital phones would possibly have a neutral
effect on other electronic apparatus, by comparasion with the old
analogue phones.