New York City-A cafe customer who is tired of talking on a cell phone sits in a happy bubble, and nearby customers are confused about the crash. A person tried to take a secret snapshot with his camera phone, but only got a blank screen. A pastor gave his church a new kind of energy-electromagnetic force-to keep his sermons calm and without beeps, chi sounds, or bells. These are a glimpse of the gadget wars that happen quietly around the world. When millions of people realize the freedom of mobile communication, some people and companies are advancing with the times. They fight technology against technology and use detectors, jammers and other things to protect privacy, security and sometimes mental health.
In the United States, cell phone interference is prohibited, but foreign companies even sell pocket jammers online on eBay, and the military and government are already using such devices, and wireless struggles already exist. Jeff Kagan, an independent telecommunications analyst based in Atlanta, said: “It’s like a fight between radar detectors and radar cannons. It has been escalating.” He said that the demand for such equipment is due to “Double-edged sword” triggered. He said: “The inventor of the mobile phone never thought that people would use it and affect the privacy of others.” “The inventor of the camera phone never thought of using it in the dressing room and other inappropriate places.” Interfering with the mobile phone ( Essentially a radio) is relatively easy. Interference usually interferes with the communication between the cell phone and the cell phone tower by selectively blocking the signal by flooding the entire area or by transmitting on the same frequency used by the phone.
Some jammers may need to be as smart as mobile phones to try to improve performance or jump to other radio channels to avoid interference. The jammer may interfere with communication within a few meters or several kilometers, depending on its strength. Commercial jammers have been sold overseas for many years, and even some Internet posts even contain instructions for building homemade models. The Federal Communications Commission prohibits people in the United States from manufacturing, selling, operating, or importing radio interference equipment. Anyone who violates this 70-year-old communication law will face up to one year in prison and a fine of $11,000 for each violation. However, FCC officials said they have received few complaints about cell phone jams and have never taken action against anyone because of this injury.
Interference industry experts pointed out that low-power equipment used by individuals is unlikely to be retaliated because it is difficult (if not impossible) for callers to distinguish between interfered signals and normal cell phone dead zones. Analyst Kagan said that even so, US law restricts the use of gps jammer and restricts the distribution of jammers to consumers. The wireless industry says that jamming equipment can harm the public. Travis Larson, a spokesperson for the Cellular Telecommunications and Internet Association, said: “150 million Americans rely on mobile phones. If these phones are blocked, doctors may mistakenly call the hospital or parents May miss the emergency call of the babysitter.”
Larson said that in order to reduce the hassle of using mobile phones, customers should use their “mute button, volume control, vibration mode, voice mail and on/off button” when appropriate. He said that disturbing certain places that may cause people to be silent, such as B. Cinema, despite the warning signs, is still risky. He said: “The jammer may penetrate other adjacent frequency bands and block the public safety radio signals used by police and firefighters.” But for safety reasons, polite advice and laws have not prevented people from buying jammers.
British company Global Gadget UK sells a series of troubleshooting products to customers in other countries, including portable jammers disguised as mobile phones, which may interfere with cellular communications 45 feet away from users. The product’s internet ad says: “They will silence those antisocials who insist on using their phones in the most obscure way.” “The good news is that they don’t know you turned them off! You will only see their signal drop Now.”
The company’s director Michael Menage said he sold hundreds of pocket jammers to people in the largest market in the United States. Each cost is about $320. Menage said: “It is illegal to use them here. People are still very keen to buy them.” He said he had sold them to the US military, but most of the customers were private or small businesses and they were fed up with distracting them from mobile Communication attention. He said some businessmen also use jammers to keep meetings quiet or disable potential eavesdropping devices, especially phones that are classified as wrong.
Jammers are also illegal in England, but are used more frequently in other parts of the world (including some parts of the Middle East, Africa, Asia, and Europe). They block calls to religious buildings such as theaters, restaurants, libraries, prisons, and mosques and churches. Interference also has long-term military and security functions. Law enforcement personnel use jammers to prevent mobile communications in dangerous situations, such as: B. Segregating hostages or protecting government officials while traveling. U.S. military convoys in Iraq used interference to protect themselves from exploding street bombs. Some bombs can use cell phones as wireless triggers, and jamming signals can prevent or delay explosions. According to Pakistani intelligence officials, human interference in the automobile column of Pakistani President Musharraf delayed the explosion of the huge bomb that exploded on December 14 after the car hit the bridge.
The field of video telephony is the latest social and technological battlefield for consumers and businesses. The transmission and transmission capabilities of images that are almost unnoticed almost anywhere at any time apparently blur the boundary between public and private spaces overnight. In 2003, about 6 million video phones were sold to American consumers, and this number is expected to double this year. Overseas sales are much higher. With the insightful or embarrassing photos of people browsing the Internet without knowing it, camera phones are prohibited in locations across the country, including many health clubs and schools. Sensitive government and corporate buildings are also trying to keep phones away, and a few states are considering new laws to restrict their use. A technical countermeasure is in progress. British company Iceberg Systems has launched a system called “safe haven”, which can disable the camera part of the phone, while not retaining other functions. Locations using such “private areas” will send a shutdown signal to a specially equipped videophone or digital camera.