Please contact your family as soon as possible and patiently wait for rescue. Wishing you peace! Recently, there have been floods and geological disasters in many parts of the country. Once affected, such a text message becomes extremely precious. After a disaster, the phone signal may not be smooth, what should I do? How do communication operators ensure communication recovery in disaster areas? Communication at the township level in Beijing has been fully restored, and signals have also been received from Zhuozhou, Hebei. Currently, some operators have stated that all villages in Mentougou and Fangshan areas in Beijing that have lost connectivity have been reconnected. On August 5th, the reporter learned from Beijing Mobile that communication at the township level in the Beijing area has been fully restored, and on this basis, in-depth reconstruction and repair work is still ongoing 24 hours a day. Image source: China Mobile provided a picture of Zhuozhou, Hebei, which was severely affected by the disaster. On the 7th, a user from the Zhuozhou area told China New Finance and Economics that "there is a signal in the urban area." As early as August 3rd, China Mobile urgently dispatched a medium-sized unmanned aerial vehicle emergency communication system to Zhuozhou to restore public network communication in the suspended area from the air, achieving effective signal coverage of over 30 square kilometers. Advanced all in use, "black technology" to overcome difficulties. The reporter noticed that in this disaster area communication security, the three major operators have taken turns using various "black technologies". According to incomplete statistics, it includes various advanced equipment and facilities such as emergency communication vehicles, satellite portable stations, satellite phones, drones, portable satellite backpack stations, equipped with remote video transmission, and off-road satellite emergency vehicles. Some operators said that the scientific and technological content of this disaster relief work is unprecedented, which can deal with difficulties such as power failure, circuit break, mountain torrents and complex terrain caused by rainstorm, which is also an important reason for this rescue operation to be extremely efficient and restore communication in a short time. Image source: For illustration, especially for unmanned aerial vehicle communication, used at high frequencies in multiple locations. Beijing Mobile has deployed two emergency communication drones, SG500 and DG-20M; China Telecom has invested in multi rotor and fixed wing unmanned aerial vehicles, unmanned patrol ships, etc. On August 3rd, Shandong Unicom urgently supported a six rotor tethered drone and rushed to Laishui County, Hebei overnight. This drone adopts a tethered multi rotor unmanned aerial vehicle platform, which provides power and information transmission through composite tethered cables. It can quickly lift up to 200 meters and stay in the air for over 24 hours, providing uninterrupted communication support such as communication and internet access for nearly 12 square kilometers of disaster areas. In addition, the reporter noticed that the operator has also taken measures to add low-frequency frequency bands. On the evening of August 4th in Mentougou, Beijing, an operator added a 900M low-frequency band to the base station in order to cover more people with the signal. There are also operators who cleverly use fishing lines and drones. Lightweight drones cannot directly drive communication optical cables, so security personnel tie the lighter fishing line to the drone and then connect the optical cable to the fishing line. The support personnel on the other side of the river use the fishing lines sent by drones to cross the river, saving the overall repair time. How to make good use of communication after a disaster? Many residents are in a hurry after being affected by the disaster due to the lack of signal on their phones. In fact, it is possible to continuously check whether the phone has a signal, as the operator is also repairing the network or taking emergency communication measures. Image source: Provided by the operator "Please contact as soon as possible