A meeting was held by the leaders of the country to discuss the process of taking treasure belonging to the kingdom of Atlantis that has been found. They were asked to come to the Graha building in a remote island region in the middle of the Pacific ocean. This building already equipped with various facilities as a safety standard.
The core committee realized that leaders from various parts of the world wanted to get information and immediately take the treasure . This awareness made the committee develop technology to eliminate all signals in this building. They realized leaders could be carrying both modern and simple eavesdropping tools such as a modified traditional telephone. The use of cell phones is very useful but in certain conditions and situations it becomes
very annoying. Important meeting rooms used by these leaders will also be kept confidential. the designing committee jammer that can emit frequencies in the GSM 1900/2800/3900 Mhz frequency range. Research result shows that the jammer can block GSM 1900/2800/3900 Mhz signals. Signal blocking tool (Jammer) able to work with coverage reaching 10 kilo meters. This step is done to overcome the problem breakthrough or information leakage. So they make devices that can disable automatically in the room What is meant is. The right device is Jammer. The jammer device is fundamentally is a signal generator device. The jammer device emits RF signals on cell phone frequency range (GSM 1900/2800/3900 MHz) which will interfere with cell phone signals and resulted Cellular frequency signal is missing. All telephone cellular on the effective radius of the jammer will not can communicate.

With this action, the meeting held for two days will never be known by other parties. All is done to reach an agreement without cheating in lifting the treasure that has been found and its existence is confirmed.

Thank you @xpilar
Warm regard from Indonesia