Now how do you listen in on the conversation in the other room. Here's an old trick. Use a thin glass, and put it against the wall. Now you can hear what they're saying in another room.

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Sep 18, 2010 · How can people listen in to conversations in a room via a plugged in telephone? I was reading Body of Lies by David Ignatius, and twice within the book, Ferris unplugs the telephone from the wall and removes the handset from the base in order to keep his conversation between himself and another person in the room confidential.

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