Can the Buzz Killer Card Really Get Rid of the Annoying 3G Data Buzz in Nearby Speakers?

If you or any of your friends have a GSM phone (AT&T or T-Mobile in the U.S.) with 3G data service, you’ve probably heard the annoying data buzz sound (watch & listen to the video embedded above for a typical example). You can hear this sound when (1) a 3G enabled phone is (2) placed near a speaker of some kind and (3) a 3G data session is in progress. Buzz Killers claims their simple looking $7.50