THERE are many ways to tap a phone; most of them against the law.
This little gadget, however, is quite legal and can be used to great advantage at home or in the office. Basically, the unit consists of a pickup coil, an amplifier and a speaker.
The full story is here:
http://blog.modernmechanix.com/2008/12/30/how-to-tap-a-phone/
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