In recent years, with the advancement of artificial intelligence technology, GPT-based large models represented by ChatGPT have demonstrated formidable capabilities in content comprehension and generation, garnering widespread attention across industries while presenting new opportunities and challenges for the communications sector. This book traces the evolution of GPT, details its practical applications in empowering the communications industry, explores future trends and critical issues in the integration of "GPT + communications," and concludes with actionable development recommendations. Tailored for technical professionals and managers in information and communications fields, it also serves as a reference for graduate and doctoral students specializing in communications, electronics, computer science, automation, cybersecurity, and related disciplines at universities.