what is that weird sound you hear when you leave a cell phone by speakers?

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Audio cables, especially unbalanced and/or poorly shielded cables are essentially antennae, and while their primary duty is to carry small AC currents from your sound system to the amplifier, they can just as easily pick up signals out of the air, just like a radio antenna. Your cell phone, by virtue of how it works, is constantly sending out radio signals to cell towers, wifi routers, etc. What you are doing is putting a radio emitter beside an antenna and amplifying it.