The International Herald Tribune is carrying a story on advances in technology that muffles/blocks cell phone signals and ringtones.
Methods include jammers that interfere with the phones' frequencies, routing systems that mute their ringers in specific places, sensors that detect active cellphones and building materials that block cellphone waves.
Now, if they can only extend this to block crinkly wrappers and wailing babies, I might consider frequenting movie theatres once again :S The entire article is available here.
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