Tired of having all manner of cell devices interrupting your conversation while you are riding in the car, or sitting reading in the coffee shop? Let Limor Fried show you how to build your own personal cell jamming device (Just read her thesis under the Research page) . I guess those cards from SHHH! which I mentioned earlier this year just weren’t working for her.
PS: FCC rules prohibit creating or using a frequency jamming device
See IEEE Spectrum, May 2005, Pg. 17, for additional information.