Interesting..
I don't have a smart phone but recently I did notice tingling sensations in my hand when holding my phone.
Quoting: Anonymous Coward 5786799 well, the signals in your nervous system are
electronic signals, so maybe, in some way, your
nerves are picking up the GigaHz signal of
a cell phone... i know that whenever i grab hold
of a 120 volt 60 Hz electric line i feel a tingling
all the way up my arm.... but, i would think that
neurologists have already studied the possibility
of such phenomenae, and published findings.