Mjolinor said:
It is fairly easy just get a friend with a mobile phone who is 20 feet away
to walk towards you several times with the phone turned off and on one
occason to do it with a phone active, ie making a call. I can't believe that
there is anything special in detecting it, it is so obvious, you really do
feel it inside your head. If there are several switched on mobile phones
about it won't work you just have to have the one.
But again, you do NOT know from this test that it is
the detection of transmitted RF energy from the phone,
and not some other cue (something that your friend is
doing subconsciously to indicate the active phone, or
possibly low-level audio cues generated by the phone
itself). In fact, you should NOT be able to reliably
distinguish which phone is "making a call" in this manner,
since even a phone which is NOT in the process of
making a call will regularly emit RF energy just to "keep in
touch" with the cell site.
I have one particular friend who will say "your phone is going to ring"
before it makes any noise and I carry it in my pocket, it is not visible to
him and more often than not he doesn't even know it is in my pocket. He can
do this totally reliably.
But once again, there's nothing particularly special from
an RF emissions standpoint, with respect to the phone in
question, at the moment the phone is GOING to ring. It
does this when it RECEIVES the incoming call signal from
the cell site, but that signal is blanketing the area - it is not
localized to the phone in question. Further, again all other
phones in the area are regularly emitting RF energy, whether
they are "going to ring" or not - it is not possible that your
friend is somehow isolating the phone which is going to ring
based on RF signals alone, and you have made no effort
to consider and remove the possibility of other unrelated
cues.
It would be fairly easy to design an experiment which actually
WOULD test for this sort of detection, but to date nothing
you have described comes close to being valid as that sort of
a test.
Bob M.