Almost everyone has a cell phone in this era. Cell phones have become an indispensible part of modern life. It’s great to be able to call anyone at anytime. Unfortunately, restaurants, cinemas, cafes, libraries and churches along with many other public places suffer from the spread of cell phones because not every of the mobile phone users know when to stop talking. Recently, many people grumble that the cell phones are really annoying that they have been disturbing by others’ the sudden phone rings all the time. While most of us grumbling, some people are actually finding extreme ways to get rid of the disturbances of cell phones. They use phone blockers to create private jamming since cell phones are basically two-way radios, like any radio, the signal can be disrupted, or jammed.
Blocking a mobile phone is the same as disturbing many types of radio communication. A cell phone works by receiving the signals through a cell tower or base station. A mobile phone jamming device transmits on the same radio frequencies as the cell phone, which disrupts the communication between the cell phone and the base station. Jamming a cell phone seems easy to achieve. All you need is a device that broadcasts on the correct frequencies. Although different cellular systems process different signals, all mobile phone networks use radio signals that can be interrupted. For example, the most common one is GSM, which is applied in digital cellular and PCS systems, operates in 900-1800MHz bands in Europe and Asia while 1900MHz band in the United States. Also, there are universal phone signal jammers, which can be both applied to block the phone signals of 900-1800MHz bands and 1900MHz band. The actual shielding range of a phone signal jammer depends on its power and the local environment, which may include hills or walls of a building that block the jamming signal or the remaining capacity of its battery. Low-powered mobile phone jammers block are generally offer a range of about 2-20 meters while some high capability devices create a „dead zone“ as large as a playground.
Cell phone signal jammers are readily available at some online shops. They are priced at reasonable prices that everyone could afford to buy one. So, will you buy a phone blocker? Please don’t jump to make a conclusion. You need to know that cell phone jamming blockers jam incoming and outgoing calls, which means that an ill-timed jam could limit people’s ability to call emergency services or report crimes. That is to say, phone jammers are not capable of distinguish between social or other cell phone conversations and an emergency call to a family member or an emergency responder. So, if you have already got a phone blocker, will you turn it on?
From: jammerall.com