These Regulations are promulgated in accordance with Paragraph 4, Article 20 of the Telecommunications Act (hereinafter referred to as “this Act”).

The terms of these Regulations are defined as follows:
1. “Number Portability”: it refers to the service which enables subscribers to retain their existing telephone numbers, when switching from the original Type I Telecommunications Operator to other Type I Telecommunications Operators engaging the same service.
2. “Operators”: it refers to the persons who have been granted the concessions and licenses by the National Communications Commission (hereinafter referred to as “the NCC”) for operation of Type I Telecommunications business.
3. “Subscribers”: it refers the persons who enter into contracts with Operators and use the telecommunications services provided by Type I or Type II Telecommunications Operators.
4. “Ported Subscribers”: it refers to the Subscribers who retain their existing telephone numbers when changing their Type I or Type II Telecommunications Operators.
5. “Recipient Operator”: it refers to the Operator who has gained the Ported Subscriber in the provision of Number Portability.
6. “Donor Operator”: it refers to the Operator from whom the Ported Subscriber has been ported in the provision of Number Portability.
7. “Concentrated Databases”: it refers to the Databases administrated by the Concentrated Databases Administrator as referred to in Chapter VII, involving all data of Ported Subscribers, state of portability and other necessary information of Number Portability for the Operators to query, exchange, store and startup the interactive procedure in relation to Number Portability or data management.
8. “Ported Subscriber Databases”: it refers to the databases that are constructed by the Operators for exchanging and storing the routing information of Ported Subscribers.
9. “Mobile Virtual Network Operators” (hereinafter referred to as MVNOs): it refers to the persons who have been granted the permissions and licenses by the Directorate General of Telecommunications, the NCC for operation of Type II telecommunications business engaging in Mobile Resale Services or Mobile Resale and Value-added Services.

The application of these Regulations of Number Portability shall include the Fixed Network Telecommunications Business and the Mobile Network Telecommunications Business.