Use the Wifi hotspot function of mobile phone to realize data transmission. The principle of QQ face-to-face fast transmission is Wifi hotspot transmission, which requires the Wifi hotspot function of two mobile phones. Face-to-face fast transfer is called file transfer. When the people around you are connected to the same WIFi hotspot environment, and at the same time, the file transfer function is turned on, and the other party is automatically searched and found, you can experience 0 traffic to send and receive files.