Block Cell Phone Numbers Do Not Call List Avoid Secret Communication Between Prisoners

Churches in European and American countries, they are located in a noble area, all uncivilized personal behavior should be strictly prohibited, and the ringing of the bell will disturb the personal behavior of others for a week, which is not civilized behavior. As a result, many cathedrals maintain a quiet and non-loud atmosphere to maintain the spirit of the gods, and install Block Cell Phone Numbers Do Not Call List to block signals when necessary. You can imagine loudly answering the phone rudely and foolishly. However, affecting the frequency of mobile phones can really solve the problem of pretending to be deaf in the cathedral. Cells are illegal and criminal areas, and there are likely to be terrorists in them. Because they should be strictly forbidden to communicate with the outside world, they should not be allowed to use mobile phones and other electronic products to communicate with the outside world, so as to prevent them from creating threats to the security of the cells. Therefore, the use of signal jammers in the cell can prevent such things from happening. In order to better avoid the secret communication between prisoners and traffic, the jammer on the mobile phone will help.

A mobile phone jammer is an instrument used to protect a cellular phone from reception. The mobile jamming device broadcasts the same frequency signal to the GSM modem. Jamming is considered successful if the mobile phone signal is disabled with the mobile jammer enabled. A cellular phone is a full-duplex device that uses two frequencies simultaneously. One is talking and the other is listening. Signals are processed simultaneously. Block Cell Phone Numbers Do Not Call List Only one of the frequencies can be blocked at a time, which results in both being blocked because the phone thinks the area is not serviced because only one of them can be obtained. The principle of disrupting mobile phones is similar to how 3g interferes with other types of radio communications. To use a cell phone, a signal is sent from the cell phone to a cell tower. A city has several cell towers. As cell phone users move around an area, the signal is processed from one tower to another. cell phone jammer transmits the same radio frequency as the cell phone. The jammer interrupted communication between the cell phone and the base station in the tower. Jamming, also known as a denial of service attack, denies wireless signals to users within the exclusive area of ​​the interfering device.