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This may sound dumb, but I have been observing that, If my mobile phone is placed on the wire of my hands free (earphones) and if my mobile vibrates, I could listen the vibration from the ear plugs. I first thought that it is just my imagination, but every time my mobile is placed on my earphones wire i could totally listen the mobile vibrating through the earplugs, even when I am listening to loud music, I could still totally hear the vibration clearly.

What is the phenomenon behind this ?

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Maybe this will explain it – SpiderPig May 24 '14 at 21:28

The little motors for making electronics vibrate are electrically noisy, and the signal can leak into the audio system.

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