Abstract: Based on the relevant theories of digital transformation, this paper puts forward a practical research framework for digital transformation of telecom operators, and gives five important transformation dimensions: value proposition, business development, operation mode, work resource, information and data. Then, based on five dimensions, this paper analyzes the four mobile network operators AT&T, KDDI, T-Mobile and Jio, which are slightly effective in the digital transformation and development at this stage, so as to summarize four typical models of digital transformation and development of mobile network operators.

Key words: intemational telecom operators, innovation, digital transformation