Unicom card can be changed into a mobile card without changing the card and the number when handling the "number portability" business. Due to different local policies, some places can't handle this business, so you need to consult Unicom customer service to see if it meets the requirements of handling this business and how to handle it. Number portability: also known as number portability, mobile phone without changing the number, is a user of a mobile telecom operator who can become a user of another operator without changing his mobile phone number and enjoy various services provided by it. For example, mobile phone users with 139 numbers switch to China Telecom Network and enjoy the telecom operation services provided by China Telecom. Number portability mainly includes fixed number portability and mobile number portability. Number portability helps to support new operators and prompt them to enter the market quickly. The implementation of port number portability is considered to be a measure that can benefit consumers, the country and the telecommunications industry. Number portability is not only beneficial to consumers, but also conducive to optimizing the market structure. Through market control measures, effective competition can be achieved and consumer welfare can be improved. For consumers, number portability can reduce the user's network transfer cost. For a country, number portability can save number resources. Number portability can break the dominant position of existing telecom operators, thus promoting market competition and optimizing market structure. After the implementation of number portability, number resources are usually managed centrally by third parties, which also saves social resources.