The jammer will make you mistakenly think that the mobile phone has entered the network blind spot

Experts say that malfunctioning devices that interfere with cell phone signals are illegal and potentially dangerous. Why did someone see them on Google on Monday? You can thank a man in Philadelphia who hated the people on his daily bus journey and a local news reporter happened to be driving. A few days after the story was released last Friday, people seem to have new interest in these devices, which are sold online for less than $40 to more than $1,000, which has attracted the attention of security experts.

Richard Mislan, an assistant professor of computer and information technology at Purdue University, said: “Ordinary people don’t know when to start using these things will trouble them.” “It is not obvious that all wireless connection systems are in Backstage, and maintain data communication in our daily lives.” Last week, Philadelphia TV broadcaster NBC10 reported that a man admitted that he used a cell phone jammer on his way to and from work to take away his speaking partner.

The man said: “I’m very likely to master the law myself, and I am proud of it.” He was called “Eric” by the broadcaster. He called someone who used the phone on a public bus, which was annoying and rude. “A lot of people are very noisy, without a sense of justice, privacy or anything else,” Eric said. “If I get tired, I will tighten the antenna and flip the switch.” The story spread. Obviously aroused people’s interest. Throughout the weekend and until Monday afternoon, between discovering Lindsay Lohan’s “Saturday Night Live” display and news about the Super Tuesday area code, “Handy portable jammer” was one of the top 10 searches in Google Trends Search.

The legality of the jammer varies from country to country. It is generally illegal to sell, own, or use one in the United States without government permission. These devices can be sold on a few websites. Mislan, a former U.S. Army communications officer, said law enforcement is “very specifically concerned” how criminals use cell phone jammers. He said that even a person who does not want to do more can only silence a nasty neighbor on the bus, which may cause harm.

For example, in the Philadelphia case, the jammer may interrupt the communication between the bus driver and the dispatcher trying to provide emergency or traffic information. This does not apply to other people in the area who may miss important calls (except for insulting speakers) “Who plays God on our phones?” Mislan said. The function of the jammer is similar to an online denial of service attack on the website-the jammer sends signals at the same frequency as the cell phones in the area.

Mislan said: “Basically, from the layman’s perspective, they will only interrupt the signal in the area.” “If you want, their signal will be louder than any other sound in the area. If a phone tries to It is impossible to connect to the tower, because if you want, another kind of noise is on the road. “Under federal law, illegal use of jammers may result in imprisonment of up to $16,000. Therefore, if they are illegal and may cause harm, why is it so easy to find jammers online? Mislan said: “This is the Internet. I can buy anything I want anytime, anywhere.” “Unfortunately, it’s all about the dollar.”