Mailing the story:

Now, for those of you who are technologically advanced, here's a detailed powerpoint presentation made by Karsten Nohl and Sylvain Munaut at Tuesday's Chaos Computer Club Congress. They showed how using a reprogrammed $15 cell phone and a laptop computer, they could find a specific phone user and intercept his or her phone calls. The process to intercept takes about 20 seconds, and once the call has been recorded, it takes about three minutes to decrypt the file into a voice conversation or a text message.