scientists at nokia have developed software that transforms a cellphone into a signal receiver and warns the user of an approching lightning strike. a lightning bolt is an electric current that emmits radio waves,with each bolt producing frequencies between 10 hertz to 5 gigahertz.according to scientists, the multiple receiver in phone, such as blue tooth,fm,triband,gsm and wi-fi,can be tuned to pick up these signals.the software then interprets them,works out the distance of lightening and tells the user if the strikes are getting closer.