“National Numbering Plan”: the numbering plan prepared and managed by the Authority for use in connection with the supply of Telecommunications services in the Kingdom. “National Plan for Telecommunications”: the plan approved by the Council of Ministers by virtue of a resolution issued thereby, which plan incorporates the strategy and the general policy concerning the Telecommunications sector referred to in Article (15) (a) of this Law. “Notice”: a letter sent to the addressee by registered mail accompanied by acknowledgement of receipt. “Number Portability”: The capability whereby a Subscriber of a national fixed serviced provided by a holder of a national fixed service License can retain the Subscriber’s telephone number when changing the service and assigning it to another holder of a national fixed service License, or the capability whereby a Subscriber of a mobile Telecommunications service provided by a holder of a mobile Telecommunications License can retain the Subscriber’s mobile telephone number when changing the service and assigning it to the holder of another mobile Telecommunications License. “Operator with Significant Market Power”: a Licensed Operator which holds twenty-five percent or more of the market share of the relevant market as determined from time to time by the Authority. When determining such matter, there shall be taken into consideration the ability of a Licensed Operator to influence market conditions, its turnover relative to the size of the market, its control of the means of Access to Users, its financial resources and its experience of providing products and services in the market. The Authority may determine that the Licensed Operator has significant market power even if such operator holds a share of less than twenty-five percent of the market or that it does not have significant power even if it holds more than such percentage. “Person”: any natural person, juristic entity or public authority. “Public Telecommunications Network”: a Telecommunications Network used, in whole or in part, for the provision of Public Telecommunications