b) Issue to such service providers radio-frequency spectrum licences for the use of radiofrequency spectrum required for their activities. 4. From 1 July 2012 and until such time as the Authority decides otherwise in the framework of a review of the national numbering plan, service providers offering mobile telephone services shall introduce and thereafter use eight digit numbers on mobile telephone networks, the leading digit of which shall be the number “7”. 5. The Minister shall ensure that necessary notifications are provided to the relevant international organisations of the change to the mobile telephone numbering referred to in the preceding paragraph. 6. The Minister shall allocate numbers for mobile telephone services to Timor Telecom and the new service providers registered and licensed pursuant to this Chapter. Article 82 Previously allocated radio-frequency spectrum licences 1. Without prejudice to paragraph 3 of this article, radio-frequency spectrum licences issued earlier shall be deemed to be valid pursuant to the present Decree-Law until they are due to expire or are otherwise replaced by the Authority pursuant to article. 2. The Authority shall review early issued radio-frequency spectrum licences, consult with the relevant licensees and replace such early issued radio-frequency spectrum licences with new radio-frequency spectrum licences issued pursuant to the present Decree-Law in order to ensure that the every radio-frequency spectrum is allocated, assigned and used in accordance with Chapter XIII and in a manner that minimises unnecessary disruption to the legitimate use of radio-frequency spectrums. 3. Any radio-frequency spectrum licences granted previously shall expire on the date of issuance of the new licences for the same radio-frequency spectrum pursuant to the preceding article, and the right to use such frequencies shall be derived solely from the new radio-frequency spectrum licences issued. Any Government entities using the radio-frequency spectrum without a licence as of the date of the entry into force of the present Decree-Law shall, within six months from that date, notify the Authority of the frequencies they are using and the purpose for which they are using them, and request a new radio-frequency spectrum licence. 4. 5. Early numbering allocations shall be deemed to be valid pursuant to the present DecreeLaw until such time as they are replaced by the Minister pursuant to preceding article or by the Authority under Chapter XIV.