Alienated Being, on 27 June 2012 - 10:21 PM, said:
It could have been a random, stray radio signal that has been floating around since the 1960s. Very strange, but I do believe that a very mundane, practical and logical explanation exists, even if my postulation is incorrect.
It's very unlikely that it's a stray radio wave. Radio waves behave a lot like light, in the sense that they keep going until they hit something, bounce off and do the same thing, slowly diminishing until they're gone for good. New York has a looooot of buildings, so the radio waves would have been absorbed, fully, a really long time ago. Plus he had no apps running, and in order for a phone (well smartphones anyway) to receive a radio signal, you have to go into the radio app and plug in headphones to be used as an antanae, so I'm pretty sure that's not it.
However, it could shead some light on what it is, it could be that you received a faulty radio antanae in your phone and someone decided to be nostalgic and turned on an old broadcast they had recorded back then and play it over a shortwave radio transmitter, lots of people have those, they're not real expensive and they're free to use.