Does China Unicom have a special internal SMS channel?

No. The SMS sending interface provided directly by China Unicom operators. China Unicom does not have a special internal SMS channel. The SMS channel is a channel for sending SMS messages. It realizes mass sending of SMS messages by connecting to the operator's gateway or third-party platform. The channels between the three major operators are all independent. China United Network Communications Group Co., Ltd. ("China Unicom" for short) was formed on January 6, 2009 through the merger and reorganization of the former China Netcom and the former China Unicom. The company has operations in 31 domestic provinces (autonomous regions and municipalities) and many overseas countries. It has branches in and around the country and more than 130 overseas business access points. It has a modern communication network and global customer service system covering the whole country and reaching the world. It mainly operates fixed communication business, mobile communication business, and domestic and international communication facility service business. , data communication services, network access services, various telecommunications value-added services, and system integration services related to communication information services.