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Cellular Phone Jammers may soon be all over

If they did—whether they switched off the cellular networks along his path or jammed local cell-phone signals—nearby mobile phones would become inoperable. As it turns out, they didn't jam cell phones. But this arcane-sounding precaution was no figment of the English imagination. Cellular Phone Jammers—already available on the Internet to security honchos and average Joes alike—are a surprisingly useful (and widely used) tool, and they could easily become as popular as cell phones themselves.

The physics of jamming a cell phone are actually quite simple. Cell phones operate by sending signals along a range of the electromagnetic spectrum reserved for their use. (In the United States that part typically is measured as either 800 or 1,900 megahertz; in Europe it's usually 900 or 1,800 megahertz.) All a cellular phone jammer needs to do is broadcast a signal on those same frequencies, and it will interfere with any devices trying to transmit in that range. The net effect for a hapless cell-phone user? The phone's screen will simply indicate that no signal is available. Odds are most people won't even notice that their phones are being jammed. They'll just assume that they're in a dead spot—and feel annoyed.

Those seeking a more robust alternative can purchase a bigger cellular phone jammer, which will cover a radius of about 100 feet. Law-enforcement officers use the big cellular jammers to cut off mobile communication in volatile situations, isolating hostage-takers and other baddies from the outside world. And corporate security folks can use them to thwart innovative industrial spies, who have several neat new tricks. These days, a boardroom Mata Hari can purchase a specially designed cell phone that will answer incoming calls while appearing to be switched off. In a business meeting, she could casually leave her phone on the table while excusing herself to go to the bathroom. Once she's gone, she can call the phone she left behind and eavesdrop on what the other side is saying in her absence. Sound farfetched? Perhaps, but this threat is the marketing hook for a new product, the e-mobile, which supposedly can detect hidden cell phones in a room. The same logic calls for installing a cell-phone jammer as well, to ensure you have complete privacy in your offices, or at least in conference rooms where important negotiations occur.

In the United States, actively jamming a cell-phone signal is illegal. The FCC, which is the government agency in charge of regulating the airwaves, has established severe penalties for doing so. If you're caught at your local restaurant with the mini jammer, it's possible you could face an $11,000 fine and a one-year jail term. Possible, but apparently highly unlikely. It seems that the FCC has never charged anyone with this crime, even though the American market is one of the most important when it comes to selling cell-phone jamming equipment. One distributor (who wished to remain anonymous) told me they've exported approximately 300 jammers to the United States this year, more than to any other country. The exporter claims that buyers include restaurants, schools (including some universities, which have installed the technology to stop students from wirelessly diddling away on their phones during lectures), and personal users.

According to the FCC, cell-phone jammers should remain illegal. Since commercial enterprises have purchased the rights to the spectrum, the argument goes, jamming their signals is a kind of property theft. But there are countries with less draconian rules. France, for instance, seems to turn a blind eye to the active use of cell-phone jammers in movie theaters, and countries such as China, Russia, and Israel either permit use of these technologies, or are very lax when it comes to enforcing restrictions.

Oka's hope is that Home Depot and the like will eventually sell the stuff by the board-foot. Since blocking signals this way doesn't require active broadcasting on a commercially leased frequency, it seems to be legal, though the cellular industry's trade association, the Cellular Telecommunications and Internet Association, doesn't think any jamming should occur, whether active or passive.

But the CTIA is unlikely to see a ban on passive jamming any time soon. The problem is that cell phones aren't just for talking anymore. And as the industry continues to provide futuristic gadgets with dizzying capabilities, it will be tougher to make a case against all forms of interference. The prevalence of camera phones, to cite just one example, poses a new problem for industrial security experts eager to keep espionage-minded shutterbugs in the dark. One company, Iceberg Systems, is beta-testing a new technology that will remotely turn off the cameras in cell phones.

In this climate, where anything can be photographed or surreptitiously recorded, the desire for privacy, and "security bubbles" of our own, will likely mean that the once-esoteric world of cellular phone jamming will become increasingly mainstream. And why not? After all, if it's good enough for the president, isn't it good enough for the rest of us?