The Fixed Network Telecommunications Business applicable to these Regulations refers to Integrated Network Business, Local Network Business, Long Distance Network Business and International Network Business.

The Fixed Network Telecommunications Business Operators (hereinafter referred to as “Fixed Network Operators”) shall provide their subscribers with Number Portability with the following numbers of classification:
1. A local telephone number at the same location;
2. 080 free phone number.

Fixed Network Operators shall provide Number Portability as referred to in the preceding provisions in the following implementation time schedule:
1. The Fixed Network Operators shall be able to provide Number Portability in their local telecommunications operation areas where it has business operation within Taipei City, New Taipei City, Keelung, Taichung City and Kaohsiung City.
2. Outside those areas set forth in the preceding paragraph, where two or above Fixed Network Operators have business operation shall be able to provide Number Portability.
Fixed Network Operators shall inform their operation areas of launch plan to other Fixed Network Operators and the Directorate General of Telecommunications, the NCC by written form within a month counting from seven months prior to the date of initial operation.

When a Ported Subscriber ceases to use his/her existing telephone number, the Recipient Operator shall return that telephone number to the original service provider assigned it within seven days either thereof or after an announcement service, if any, is terminated, and shall perform the required notifications in accordance with the provisions set forth in Item 10, Paragraph 1 or Paragraph 5 of Article 22. As the original service provider assigned that telephone number has stopped its business operation or that telephone number is not held by any Operator, that telephone number shall be returned to the NCC.
The term “cease to use” as referred to in the preceding paragraph does not include the conditions that an inheritor continues to use a telephone number through inheritance, or a surviving or new company continues to use its forerunner's telephone number after consolidation or merger.
Unless a Ported Subscriber ceases to use his/her existing telephone number, the Donor Operator shall not reassign that telephone number to another Subscriber.

Fixed Network Operators shall mutually provide Number Portability on a reciprocal basis, and shall conform in accordance with the principle of impartiality and reasonableness, and shall be non-discriminatory.

The service contract between a Fixed Network Operator and its Subscribers shall, in a distinct way, state the following proceedings:
1. Subscribers may request for the provision of Number Portability from the commencement date of the provision of Network Portability in accordance with Article 6.
2. Fixed Network Operators may offer a Subscriber's data necessary for the provision of Number Portability to other Operators, Type II Telecommunications Operators, and the Administrator of Concentrated Databases.
3. Fixed Network Operators may charge fees for porting process of Number Portability in accordance with Paragraph 1 of Article 43.
If the service contract between a Fixed Network Operator and its original Subscribers has not contained the provisions set forth in Paragraph 1,2 and 3, the Fixed Network Operators shall inform its original Subscribers by written form within two months from the promulgation date of these Regulations.

A Fixed Network Operators shall maintain reasonable quality of customer services and quality of network performance, when providing communications services for Ported Subscribers.
By January 10 and July 10 of each year, each Fixed Network Operator shall compile and submit information on the number of Subscribers ported to/from its networks, the failure rate of porting process, average duration of porting process, additional call set-up delay time on average calculated by calling sampled Ported Subscribers, and so on, for the previous six months to the NCC. The report formats shall be formulated and announced by the DGT.