Generally speaking, the Simple Cell Phone Jammer Ppt of the exam site is to shield the mobile phone by interfering with the mobile phone signal of the designated band. The frequency spectrum of the previous mainstream network 4G is generally between 1700MHz and 2600MHz. For example, China Mobile's 4G is mainly at 2320-2370 MHz, 2575- 2635 MHz two major frequency bands, while China Telecom is in the 1755-1785 MHz, 1850-1880 MHz two major frequency bands, and China Unicom is in the 1955-1980 MHz and 2145-2170 MHz. The examination room only needs to perform electronic interference on the above frequency bands, and the 4G network of the mobile phone cannot be connected, thus achieving the function of shielding the signal. But the problem lies in: cell phone jammer The frequency band of the 5G network is relatively higher, and the unruly test room staff is likely to forget the new thing 5G, which will result in the 5G signal not being shielded.
For example, China Mobile's 5G is mainly deployed in the 2515~2615MHz frequency band, China Telecom's 5G is deployed in 3400MHz-3500MHz, and China Unicom is 3500MHz-3600MHz. Since the 5G frequency bands of China Telecom and China Unicom are continuous, the two have made it clear that they will jointly build and share a 5G wireless access network based on a continuous 200MHz bandwidth of 3400MHz-3600MHz. Judging from the distribution of the above frequency bands, we even have reason to doubt: the cheating examinee using Simple Cell Phone Jammer Ppt is likely to be the number card of China Telecom or China Unicom. After all, the 5G frequency band of China Mobile is closer to the 4G frequency band, and the possibility of being missed Not too high, and the 5G frequency bands of China Telecom and China Unicom are much higher than the mainstream 4G frequency bands in the past, and there is indeed the possibility of being missed.