What is the most traditional mode of communication?

The traditional mode of communication in China is a book-passing mode with horses as the medium and flying pigeons as the medium. There are three major operators in front of the operator's communication mode, which is the main communication mode in modern China, with mobile companies as the main communication mode, telecommunications, China Unicom and other communication tools.

Including the emergence of more mobile communications, such as WeChat and QQ. The traditional way of communication in China takes a long time, so it is replaced by modern communication.