Abstract: At present, number portability service has been implemented in more than 80 countries and regions around the world. Most countries regard the number portability service as a basic service for users. But it is a complex system project to realize number portability, which involves not only the implementation of technology, but also the operation and management. China's number portability service has gone through 10 years from the pilot test to this year's nationwide development, which is gradually carried out in multiple stages, and carried out research and test from system construction,policy standards, technical programs and other aspects. Up to now,a set of technical and management solutions suitable for China's national conditions are explored. With the nationwide number portability service development,the overall number portability service will be continuously improved.

Key words: number portability, fixed number portability, mobile number portability