What does Unicom's super letter mean? Thank you.

Chaoxin is a product system of multimedia content transmission, sharing and aggregation based on the spread of users' mobile phone numbers in the era of mobile Internet, and it is the entrance for users to use mobile Internet services. It takes the platform as the core, clients, application plug-ins and other users as the contact points, file transmission as the breakthrough point, and video and music as the important content carriers to realize the breakthrough products of operators in the era of mobile Internet. The core of Chaoxin product system is the natural social relationship based on the user's mobile phone number. At present, it includes four products: address book, picture, video and music, and the products can be flexibly expanded according to the needs.