"湖北考生拍题上传被取消考试资格"引起热议，网友质疑为何手机能带进考场，更加质疑手机信号屏蔽 器为何形同虚设。多位通信行业技术人士对《 每日经济新闻》记者表示，该考场信号屏蔽器或未升 级，导致未能屏蔽刚商用两年的5G手机信号，导致手机能正常访问网络，需要更换屏蔽设备。 每经记者｜刘春山 每经编辑｜文多 该业内人士同时向记者分析，该作弊考生使用的很可能是中国电信或中国联通的号卡，毕竟中国移动的 5G频段与4G频段更接近，被漏掉的可能性不太高。而中国电信和联通的5G频段远高于过去4G的主流频 段，确实存在被漏掉的可能。 此前主流网络4G的频谱的范围一般在1700MHz到2600MHz之间，比如中国移动的4G主要在 2320~2370MHz、2575~2635MHz两大频段，而中国电信则在1755~1785MHz、1850~1880MHz两大频 段，中国联通在1955~1980MHz、2145~2170MHz。 另外一位运营商技术人士对《每日经济新闻》记者表示，手机信号屏蔽器的工作原理是噪声堵塞，在特 定频段发出无意义的信号，压制正常的手机信号。屏蔽器一般不支持软件升级，考场要想屏蔽全部的 5G信号频段，建议更新设 ...

Core Insights - The market demand for mobile signal jammers is rapidly increasing due to the proliferation of 5G technology and the deepening application of the Internet of Things (IoT) [1][13] - In 2024, the market size of China's mobile signal jammer industry is projected to reach 1.405 billion yuan, representing a year-on-year growth of 8.58% [1][13] - The application scenarios for signal jammers have expanded beyond traditional settings like examination rooms and prisons to areas with high information security and order maintenance requirements [1][13] Industry Overview - Mobile signal jammers are devices that emit interference signals to block communication between mobile phones and base stations, utilizing technologies such as frequency doubling, frequency division, and frequency hopping [2] - The industry has evolved through four main stages: the nascent stage (1999-2005), development stage (2005-2010), rapid development stage (2010-2017), and the current mature and innovative stage (2017-present) [4][5][6] Industry Development History - The first mobile signal jammer was developed in 1999 by Tsinghua University's software media security technology laboratory, primarily used in high-security areas like military bases and government departments [4] - From 2005 to 2010, the technology of mobile signal jammers upgraded to support multiple communication standards, expanding their application to government and financial institutions [4] - The period from 2010 to 2017 saw a diversification of products and a decrease in average prices, with the price dropping from 1,500 yuan per unit in 2010 to 888 yuan in 2017 [5] Industry Chain - The upstream of the mobile signal jammer industry includes raw materials, electronic components, and technology research and design institutions, which directly impact the stability and effectiveness of jammers [8] - The downstream applications include various settings where mobile phone usage is prohibited, such as schools, gas stations, churches, courts, libraries, hospitals, and government facilities [9] Market Size - The mobile signal jammer market is expected to grow significantly, driven by technological advancements and the increasing demand for information security [13] - The modern jammers are lighter, more portable, and capable of effectively blocking complex signals, enhancing user experience [13] Key Companies - Leading companies in the industry include Shenzhen Oriental Dragon Communication Co., Ltd., Ningbo Dazhan Electronic Technology Co., Ltd., and Fujian Lingxin Information Technology Co., Ltd., which have significant market share and technological advantages [15][17] - These companies focus on high-performance jammers that support multiple frequency bands and are widely used in high-security environments [17][19] Industry Development Trends - Continuous technological innovation and upgrades are expected, with a focus on improving shielding effectiveness and stability [21] - Market demand is becoming more diversified and personalized, with companies needing to adapt to various user requirements and provide customized solutions [22][23] - Strengthening industry regulation and standards is anticipated, with the government likely to implement stricter laws to ensure public safety and information security [24]