Why can't I make a phone call on the plane?

1, there is no definite conclusion as to whether using mobile phones on airplanes will definitely affect airplanes. However, as a wireless communication device, the mobile phone will emit electromagnetic waves and occupy a certain frequency when dialing or answering, and the communication and navigation equipment of the aircraft also has its own special frequency and frequency band. If there are other radio signals in this spectrum, such as cell phone signals, they will interfere with each other. Make the judgment of the received signal wrong. Although the frequency band occupied by mobile phones is different from that of radio navigation, there are always external stray signals in radio equipment, and the electromagnetic waves emitted by mobile phones are likely to interfere with the navigation system of aircraft. As you may know, when you are talking on a fixed telephone or working on a computer, if someone around you calls your mobile phone, the sound will come from the fixed telephone receiver or the computer speaker. The sound of "Opportunity ..." will fluctuate briefly on the computer screen. This is the interference of mobile phones on electronic equipment. As you can imagine, if you make a phone call on an airplane, the electronic equipment on board, including navigation equipment, will have a similar reaction.

2. The mobile phone is also in danger during standby. First, it is possible that you will receive a phone call, and there will be a strong signal one or two seconds before it rings, which will cause interference. Secondly, the national gsm mobile network is divided into countless location areas, and the location areas will be updated when the mobile phone passes through the location areas, and the mobile phone will be automatically registered. For example, from other places to Beijing, mobile phones will receive welcome messages from local mobile phones. The mobile phone will receive a signal from the local network.