In France and Japan, use of portable cell phone jammers is legal in movie theaters, art galleries, concerts, and other public venues.

A Philadelphia, Pennsylvania man is taking responsibility for cleansing the air of loud mobile calls by operating a cell phone jammer on buses and in other public places when annoyed. So far the individual has not been charged with any crime.

Several theater chains are becoming vigilant in preventing cell phone use during a movie - could small radius jammers be a safe and physically unobtrusive alternative in these situations? Granted, the glow from a cell phone is almost as annoying as the accompanying conversation, but blocking phone transmissions within parts of a large public venue does not prevent communication of wide-scale emergency alerts, as long as the entire area is not blanketed by jammers.

But once we accept the use of jammers in public venues for our personal benefit, do we open the door to the intrusion of Phone Jammers in traditionally private realms? The technology to prevent the use of cell phones is readily available and already comes in a small package - a future where every car comes with a pre-installed jammer to block your smart phone's operation once the car starts moving is believable.