Here's some instructions on how to foil a phone tap.
Think the Feds might be jacked into your home line? Well, there’s no need to skulk down to the corner pay phone to conduct your business. All you need is a C note. University of Pennsylvania computer science professor Matt Blaze dissected the wiretap equipment commonly used by law enforcement and found a few, um, bugs. Spies, it turns out, don’t like to record dead air, so they turn the system off by playing a special C-pitched tone when the target phone is hung up. As a result, anyone with an MP3 player and a recorded C can prevent eavesdroppers from snooping on their private chatter. It doesn’t work with all listening devices, though, so there’s no guarantee the NSA won’t come calling.
Source: Wired 14.12: START
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