OTA SIM card air download technology: it is a technology for remote management of SIM card data and applications through the air interface of mobile communication (GSM or CDMA).The air interface can use WAP, GPRS, CDMA1X and short message technology.The adoption of OTA technology enables mobile communications to provide not only voice and data services, but also new business downloads.In this way, the application and content service providers can not be limited by the platform, and continue to develop more personalized services close to the needs of users, such as information on demand, interactive entertainment, location services and banking transactions.Through OTA air download technology, mobile phone users can use OTA mechanism to download various business menus provided by the network to mobile phones according to their personal preferences with simple operation, and can also customize specific businesses according to their own wishes.