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Restaurant start to use cell phone jammers

When you enjoy lunch, if all of a sudden there was a phone ringing around, you may have a dine with noise, you will be what kind of mood? May you have a very bad meal recalls. This is why more and more restaurants started to answer the phone at the door marked banned in restaurant. But, obviously, the effect is poor. So restaurant operators have to choose to use cell phone jammer.
At least two restaurants in London, UK, have installed jamming devices aimed at preventing customers from making or receiving mobile phone calls when dining at the restaurants.

Then, let us know about the working principle of the device. 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 cell-phone jamming device 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.

Why have to have a jamming device?

Verizon Wireless visited an upscale restaurant in Maryland over the last year, the restaurant owner said. The owner, who declined to be named, said he bought a powerful jammer for $1,000 because he was tired of his employees focusing on their phones rather than customers.

Any establishment -- whether it is a restaurant, a bookstore, a theater, etc. -- should have the choice of whether or not to allow mobile phone usage by creating 'dead zones' in which wireless reception is unavailable. Short of building a lead box around the building, there should be a way to electronically prevent wireless communication in designated zones. One method might be to electronically scramble the appropriate airwave spectrum. The ability to specify the range of dead zones would allow a theater, for example, to prevent wireless communication in screening rooms while allowing it in the theater lobby. This would effectively force movie-goers to do the right thing by leaving the screening room to use mobile devices for calls, email, SMS, or any other activity that requires wireless communication.

You’re sitting in a restaurant trying to have an intimate conversation with — and this is the important part — a person who is actually sitting across from you. Suddenly, a stranger’s voice pitches higher and floats across the room. He’s having a conversation, too, but it’s on his cell phone and there’s nothing intimate about it. You can cast a death-ray stare at the offender, confront him directly or ask a waiter to do it, risking fireworks and drama. Whatever you choose to do, a pall has settled over the room and the rosy glow of your intimate dinner has evaporated.