I came up with an idea back in 2007 when the mysterical phone viral controversy happened.But I am sharing it in pak ideas now. ALthough I have discussed it with lot of people . I really searched hard on the phone viral controversy. Some people say it was just a rumour, regardless of rumors.It is quite obvious that a speaker, loud speaker etc. is a electromagnetic transducer that converts electronic energy into sound. Now if I say the culprits used different sound frequencies remaining within the limits of audible frequencies(i.e 20hz to 20000hz)then it would be right to say that people were affected by such mixed bag of different sound frequencies.Many people say that phone speakers can only convey limited range(some say 10khz). Like I said it is an electronic signal that reforms into sound therefore speaker can convert any kind of sound frequency whether it is an infrasonic sound or an ultrasonic sound and if i say 20000hertz i.e. 20khz relates to the destruction in vacuum i.e destruction of stars in space,then it wouldn't be wrong for me because sound needs a medium to travel right????one of the medium is gas now if I say that the parent star of any universe is destroyed and considering that such parent star is a sun like star then it obviously would have gaseous in it now when the star is destroyed the gaseous will emit out from it and for the time being there will be a large noise nearby in such vacuum(space).There are interstellar gases(i.e interstellar medium which consists of 99% gas and 1% dust) in space and it would not be wrong to say that sound actually travels in that medium, what I am trying to say is that there maybe a heavy chance that sound can travel in a vacuum in two conditions
1)-At the time of destruction of stars for the time being
2)-In interstellar gases that travels in space.

Now I have proved two things in this idea

1)- Sound may travel in space regardless of its frequency.
2)- Mixed bag of high frequencies maybe the actual cause behind phone viral controversy.