This is the flight mode of the mobile phone. When the other party calls you, the phone will not be turned off. By the way, I will give you some knowledge about the flight mode. It is the plane in your picture. It is said that the earliest "flight mode" came from Huawei. Li Changzhu, vice president of Huawei's consumer business mobile phone product line, invented the patented technology of "flight mode". The original intention of the design was to prevent mobile phone signals from interfering with the instruments on the aircraft and ensure flight safety. In other words, this "flight mode" is a function independently developed by China. The principle of "airplane mode" is to turn off the communication module of the mobile phone. At this time, you cannot make or receive calls, send or receive text messages, or surf the Internet. You can only use some software that does not require network functions, such as local reading. After turning on "airplane mode", the entire phone is in "anti-interference" mode. Someone once did an experiment. When charging in airplane mode, the charging time of mobile phones will be significantly faster. The charging time of Apple mobile phones is shortened by 18 minutes. Sometimes, when a smartphone loses signal, we can choose to shut it down or disconnect from the network, which is equivalent to restarting the network. But we can actually turn the "airplane mode" on and off for a while, which will save much more power than turning it off. Naughty children playing with mobile phones, especially smart phones, have always been a headline for many adults, because if they are not careful, they will use up your data, or even directly charge money through games. When airplane mode is turned on at this time, they will not be able to perform network operations and will naturally not consume data. Maybe sometimes, we need a complete gaming environment, especially when playing mobile games. A sudden phone call can be very frustrating. But if you turn on "airplane mode" and then connect to WiFi, you will be surprised to find that you can also play games in airplane mode, so you can play games without being disturbed. Of course, the last feature is that you can use your mobile phone on the plane, provided that the mobile phone is in "airplane mode".