(Michao, a cross iPhone, Android, Symbian mobile phone platform produced by Xiaomi Technology, and a free instant messaging tool on the mobile end of mobile phones across mobile, China Unicom, and telecom operators, can conduct unlimited free real-time information exchange, send and receive pictures and audio with your Michao contacts through mobile networks (WiFi, 3G, GPRS), which only consumes network traffic. This document includes the following annexes:)