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Numbers stations are shortwave radio stations of uncertain origin that broadcast streams of numbers, letters (using a phonetic alphabet), or words. It is not known publicly with certainty where these signals originate or what purpose they serve. The voices that can be heard on these stations are often mysterious: mechanically generated; spoken in a wide variety of languages; usually female, but sometimes male or those of children. Numbers stations appear and disappear continuously, although some stick to regular schedules, and their overall activity has increased slightly since the early 1990s.
Originally posted by Shadow88
..... 4 8 15 16 23 42......
Originally posted by Jeremiah25
I have no idea why you would hear them on your phone, but it certainly sounds like what you are describing.