Use of smart phones have a number of adverse health effects on children, childhood leukaemia, impaired motor function, delayed reaction time, headaches, dizziness, fatigue, weakness, and insomnia. So there should be a strict law in this regard.
Jelianggao explained that though they strictly observe regulations in the facility, there are instances that they cannot control or prevent, like when cellphones were brought inside by throwing the gadgets over the jail’s perimeter the fence.
This past spring, both Hong Kong and Canada announced they would consider legalizing signal jammer in an effort to curb bad phone behavior in public. Around the same time, the leaders of India’s parliament revealed they had already installed the devices to avoid interruptions during sessions.
The U.S. strategy was defined in six words: “Put them back on the wire.” By neutralizing radio-controlled bombs, the jammers would force insurgent bombmakers to use more rudimentary triggers, such as command wire. Those triggers would be simpler to detect, in theory, and would bring the triggermen closer to their bombs, where U.S. troops could capture or kill them.
The telephone is almost everywhere,but it brings us convenience at the same time, but also bring us many troubles. After all, not all mobile phone users know when to stop talking. At this time we need to use the cell phone jammer, to protect a quiet environment. For example, in churches, libraries and other places.
Cell phone jammers have been around since 1998. The devices, which cost around $1,000, can block signals in a room about the size of a movie theater. The jammer sends out a low-power, encoded radio signal or modulated radio wave.