extended in order to fulfil other general interest objectives as defined in accordance with European Union law. Article 130a. (New, SG No. 105/2011, effective 29.12.2011) The Commission shall regularly, at least once every two years, review the necessity of the restrictions referred to in Article 130 (2) to (4) herein and shall make the results of this review public on the Internet site thereof. Article 131. (Repealed, SG No. 105/2011, effective 29.12.2011). Chapter Seven NUMBERS, ADDRESSES AND NAMES Section I (New, SG No. 105/2011, effective 29.12.2011) National Numbering Plan Article 132. The National Numbering Plan shall constitute an allocation of the numbers used in electronic communications networks for identification, routing and billing by undertakings providing public electronic communications services. Article 133. (1) The National Numbering Plan shall be prepared by the Commission in accordance with the regulatory policy referred to in Item 7 of Article 30 herein, respecting the principles of objectivity, proportionality, non-discrimination, transparency and timeliness, and taking into consideration national and public interests. (2) The National Numbering Plan shall be prepared taking into consideration the acts of international organizations and/or competent bodies thereof, relevant to numbers, addresses and names, in order to ensure effective use of the numbering space. (3) The National Numbering Plan shall be promulgated in the Official Section of the State Gazette. (4) The Commission shall keep a public register of the numbers, addresses and names provided for use to undertakings. Article 133a. (New, SG No. 105/2011, effective 29.12.2011) The rules for use, allocation and the procedures of primary and secondary provision for use, reservation and withdrawal of numbers, addresses and names shall be established by the Commission by ordinance after conduct of a public consultation under Article 36 herein, and the said ordinance shall be promulgated in the State Gazette. Section II (New, SG No. 105/2011, effective 29.12.2011) Number Portability Article 134. (1) (Amended, SG No. 105/2011, effective 29.12.2011) The undertakings providing electronic communications services through use of numbers from the National Numbering Plan shall ensure a possibility to port the numbers, with subscribers being able to retain: 1. (amended, SG No. 105/2011, effective 29.12.2011) their geographic number when changing the undertaking providing the respective service and/or when changing their address within the same geographic national destination code; 2. (amended, SG No. 105/2011, effective 29.12.2011) their non-geographic number when changing the undertaking providing the respective service; 3. (amended, SG No. 105/2011, effective 29.12.2011) their national significant number when changing the undertaking providing a mobile telephone service. (2) (Amended, SG No. 17/2009, repealed, SG No. 105/2011, effective 29.12.2011).