White clouds on a red background are Caiyun app. Hecaiyun is the entrance of China Mobile's unified cloud products, which integrates personal cloud, family cloud and Cai Yun network disk to provide users with safe, intelligent, convenient and unlimited cloud storage services and meet the backup of digital assets such as mobile phone photo albums, WeChat files and address books. China Mobile users can use HeCaiyun to back up photos, videos, address books, etc. , and can be easily synchronized and unified management between mobile phones and computers, support online video playback and document browsing, and can also be shared with relatives and friends.