China Telecom Corp Ltd (China Telecom), a subsidiary of China Telecommunications Corp, provides telecommunications and wireline and mobile telecommunications services. The company is actively involved in cloud computing and computing power, Big Data, AI, and quantum technology. It offers a wide range of wireline or traditional value-added services, including Internet data center, e-surfing HD, color ring tone (CRT), system integration, super cordless telephone, caller ID, short messaging service (SMS), and telephone payment.

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China Telecom accelerated the development of self-reliance and self-strengthening in high-level science and technology fields, focusing on its No.1 technology "Xirang." Significant achievements were made in scientific and technological innovation, particularly in cloud and cloud-network integration, AI, quantum technology, and the development of the 6G system architecture. The company's server operating system CTyunOS passed the national security and reliability assessment, and breakthroughs were achieved in technologies such as ubiquitous computing power perception and computing-power integration. The company also advanced the "AI+" initiative, embedding AI into core operations and developing AI application scenarios across five key areas: intelligent customer services, intelligent marketing, intelligent operations, intelligent R&D, and intelligent management. As of December 2025, the company had a professional research and product development personals of 47,164 employees. In FY2025, the company incurred an expense of CNY15,368.8 million on its R&D activities, which grew 7%YoY and stood at 2.9% of the company’s total revenue.