The mobile phone jammer can connect the base station and the mobile phone through latitude-free radio waves within the effective frequency range, and use a certain frequency of baud rate and modulation to complete the transmission between data and sound. This is the communication principle of Florida Man Uses Cell Phone Blocker , according to this principle, the library mobile phone signal jammer can scan the low-end frequency from low to high to high-end frequency at a certain speed when it is working. Garbled interference, so the mobile phone cannot detect the signal sent by the base station when receiving data. This kind of interference cannot completely establish a connection between the mobile phone and the base station. This form of expression is that the signal cannot be searched. Service, no signal, etc., in this case, it is impossible to send messages and make calls. Due to the rapid development of wireless network, it has now developed to 4G network, and many test rooms use the older model cell phone jammer, which can only block 2G networks such as PHS, China Mobile, China Unicom, etc., while 3G and even current 4G networks Helpless, cracking method: use a 3G or 4G card.
Because the working principle of the library's Florida Man Uses Cell Phone Blocker is to shield the mobile phone by interfering with the mobile phone signal of the specified band, as long as the receiving and transmitting frequency of the mobile phone is modified, it can be prevented from being shielded. The mobile phone signal jammer only blocks the mobile phone signal of 900-1800MHZ, while the mobile phone's The receiving and transmitting frequency is 8501900MHZ, which is much larger than the shielding range of the mobile phone signal jammer, so as long as the receiving and transmitting frequency of the mobile phone is adjusted to the maximum in the mobile phone settings, the mobile phone signal can be received normally. This method has relatively high environmental requirements, and the premise is that there must be an available wireless network around. Some cell phone jammers cannot shield VIF signals and can communicate with the outside world. Bluetooth cracking method. It is suitable for short-distance communication in the shielded area. Some mobile phone jammers may ignore the transmission function of Bluetooth without shielding, so we only need to install the Bluetooth messaging software on the mobile phone to communicate normally in a small range.
