4. Rules on regulated wholesale roaming charges laid down in Articles 9, 10 and 11 shall apply to the provision of access to all components of wholesale roaming access referred to in paragraph 3 of this Article, unless both parties to the wholesale roaming agreement explicitly agree that any average wholesale roaming charge resulting from the application of the agreement is not subject to the maximum regulated wholesale roaming charge for the period of validity of the agreement.
Without prejudice to the first subparagraph of this paragraph, in the case of wholesale roaming resale access, mobile network operators may charge fair and reasonable prices for components not covered by paragraph 3.