What is the reason for the widespread SMS failure on China Unicom?

So far, the official has not announced the cause. Just saying it's back to normal.

On February 10, the last working day before the New Year, China Unicom’s text messages experienced widespread failures. A large number of Weibo netizens reported that they could not receive text messages or verification codes. According to statistics, netizens from at least six provinces, including Beijing, Tianjin, Hebei, Shanxi, Shandong, and Inner Mongolia, have reported problems with China Unicom’s SMS service.

The official Weibo account of China Unicom Group Corporation’s customer service responded in the comment area, “It is currently under emergency treatment, please pay attention later.” ?And it is recommended that if you need to receive text messages urgently, you can temporarily turn off the volte function. Subsequently, China Unicom's official Weibo announced the latest progress: Dear customers: Due to the growth of our SMS business, congestion occurred. Starting at 7:10 am on February 10, some customers reported that SMS messages could not be received or were delayed. After emergency expansion and optimization, It returned to normal at 10:55 am.

The information and communication industry is my country's most promising key basic industry at this stage. It plays an important supporting role in economic transformation and upgrading. Its importance and prosperity will surely reach unprecedented heights. National policies promote my country's informatization construction and once again make it clear that the communications industry is an important beneficiary link in stimulating economic growth. From 2016 to 2020, China's communications industry-related policies continued to increase, increasing specific policy support and empowering the development of the industry. From March to August 2020, the State Council and the Ministry of Industry and Information Technology issued multiple documents to deploy the 2020 development plan for the information industry such as 5G, industrial Internet, IPv6, integrated circuits, and software.

The information and communication industry is a strategic, basic and leading industry that builds national information infrastructure, provides network and information services, and comprehensively supports economic and social development. With the accelerated development of technologies such as the Internet, Internet of Things, cloud computing, and big data, the content of the information and communications industry continues to enrich, extending from traditional telecommunications services and Internet services to new business formats such as Internet of Things services.

The information and communication industry is currently one of the fastest growing and most innovative fields. During the "Twelfth Five-Year Plan" period, the information and communication industry made great contributions in supporting and leading economic and social transformation and development, improving government governance capabilities and public services, and also had a great impact internationally. During the "Thirteenth Five-Year Plan" period, our country is facing a more complex domestic and international development environment, and is striving to promote supply-side structural reform, effectively transform the development model, and ensure the realization of the grand goal of building a moderately prosperous society in an all-round way. The information and communication industry will also face new developments. Opportunities and challenges.

In accordance with the requirements of the "Thirteenth Five-Year Plan for National Economic and Social Development" and relevant documents of the State Council, the Ministry of Industry and Information Technology prepared the "Information and Communications Industry Development Plan (2016-2020)". This plan is an important basis for guiding the development of the information and communications industry in the next five years, accelerating the construction of a network power, promoting the simultaneous development of the "four modernizations", guiding the behavior of market entities, and allocating government public resources.