Mobile cloud security users can use the following business functions by accessing the Web portal or smartphone client of the mobile cloud security business platform. It mainly includes: 1) mobile device and application management (MDM, optional): it is provided for enterprise administrators, and mainly includes functions such as device management, policy management and application management. 2) User identity security authentication (that is, Tianyi U shield, optional): provide users with the hardware security authentication function based on UIM card level, and provide high-level security guarantee for the secure office system. It mainly has the functions of strong authentication login, secure data storage and transmission, sensitive operation protection (legal electronic signature), application authentication and so on. And provide users with Tianyi U shield mobile phone client, with digital certificate application and management functions. 3) Secure data channel VPDN (optional): Provide users with a VPDN virtual private network channel isolated from the public Internet to ensure that users can safely access office applications and services. For more service offers, click on "official website" Customer Service 5 1 below to answer your questions.