The jamming device overwhelms the phone by sending a signal that has the same frequency as the phone and has enough power to make the two signals collide and cancel each other. Mobile phones are designed to increase power with little interference. Therefore, the jammer needs to identify and adjust the performance enhancement of the mobile phone. Cell phones are full-duplex devices, which means they use two separate frequencies, one for talking and one for simultaneous listening. Some jammers only block one of the frequencies used by the phone, and both frequencies are blocked. The phone was tricked into thinking that there is no service because it can only receive one of the frequencies. Less complex devices can only block one set of frequencies, while complex cell phone jammer can block multiple network types at the same time to turn off dual-mode or triple-mode phones. These phones will automatically switch between different network types to find the open ones. signal. Some high-end devices block all frequencies at the same time, while other high-end devices can be tuned to a specific frequency.
Japan relaxed mobile phone interference rules more than two years ago and allowed the use of licenses in some public places such as theaters. The model prices of Global Protection & Intelligence Inc., a Los Angeles-based mobile phone interference seller, range from $1,600 to $2,600. They prevent cell phone frequencies from entering certain areas, while more expensive models interfere with larger areas. The briefcase-sized equipment sold by the company can cover a radius of about 150 meters, while the cigar box-sized model can keep the conference room without signal. Mobile phones are convenient smart tools that allow us to call to notify the arrival of dinner or check hotel reservations via the Internet. In addition, they confuse the police, people who are often bullish or texting while driving, and schools that are adapting to modern times and setting strict rules for using mobile phones. well. You know, school hours are not time for mobile phones, and anyone with a teenager in a building knows that these tools have become a major part of a child’s life. Texting, tweeting, speaking and using the Internet constitute a large part of teenagers’ daily lives. The smallest thing we can do is to assume that they stop using their mobile phones during school to better focus on the classroom.