1, network infrastructure: the three major carriers have a huge network infrastructure, including mobile communication base stations, fiber-optic networks and data centers, etc. These facilities form the basis of information transmission, providing the necessary network environment for software engineering.

2. Big Data Processing: The three major carriers handle a large amount of communications data, including user call records, SMS, data transmission, etc. By analyzing and processing this data, they can provide various services and products, such as traffic statistics, user profile analysis, and intelligent recommendations.

3, mobile application development and testing: With the popularization of smartphones, mobile applications have become an important part of people's daily life, and the three major carriers provide services such as mobile application stores and application recommendation and testing, which promote the development and innovation of mobile applications. An operator is a company or organization that provides communication services in the field of telecommunications, and its main responsibility is to build, maintain and operate telecommunications network facilities in order to provide telephony, mobile communications, broadband Internet and other related communication services to individual and business customers.