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In those circumstances, the Verwaltungsgericht Köln (Administrative Court, Cologne, Germany), taking the view that an interpretation of EU law is necessary in order to resolve the dispute in the main proceedings, decided to stay the proceedings and to refer the following questions to the Court of Justice for a preliminary ruling: ‘(1) (a) In a case where a mobile communications tariff which customers can use abroad and which provides a monthly inclusive data volume for mobile data traffic, after the consumption of which the transmission speed is reduced, can be extended by a free tariff option on the basis of which certain services of partner companies of the telecommunications company can be used domestically without the data volume consumed through the use of those services being offset against the monthly inclusive data volume of the mobile communications tariff, whereas abroad the data volume in question is offset against the monthly inclusive data volume of the mobile communications tariff, is the concept of the regulated data roaming service within the meaning of Article 6a in conjunction with Article 2(2)(m) of [the Roaming Regulation] to be understood as meaning that the mobile communications tariff and the tariff option are to be jointly qualified as a single regulated data roaming service with the result that a non-offsetting of the data volume consumed through the use of the services of partner companies against the monthly inclusive data volume is impermissible only domestically? (b) If Question 1(a) is to be answered in the affirmative: In a situation such as that in question in the present proceedings, is Article 6a of [the Roaming Regulation] to be interpreted as meaning that the offsetting of the data volume consumed through the use of the services of partner companies against the monthly inclusive data volume of the mobile communications tariff abroad is to be qualified as the charging of an additional fee? (c) If Question 1(a) and Question 1(b) are to be answered in the affirmative: Does this also apply if, in a situation such as that in question in the present proceedings, a fee is demanded for the tariff option? (2) (a) If Question 1(a) is to be answered in the affirmative: In a situation such as that in question in the present proceedings, is the first subparagraph of Article 6b(1) of [the Roaming Regulation] to be interpreted as meaning that a fair use policy for the use of regulated roaming services at retail level can also be provided for the tariff option as such? (b) If Question 1(a) is to be answered in the affirmative and Question 2(a) is to be answered in the negative: In a situation such as that in question in the present proceedings, is the first subparagraph of Article 6b(1) of [the Roaming Regulation] to be understood as meaning that a common fair use policy for the use of regulated roaming services at retail level can be provided both for the mobile communications tariff and the tariff option with the result that the overall domestic retail price of the mobile communications tariff and/or the sum of the overall domestic retail prices of the mobile communications tariff and the tariff option is to form the basis of the calculation of the data volume to be provided within the scope of a common fair use policy? (c) If Question 1(a) is to be answered in the affirmative and Question 2(a) and Question 2(b) are to be answered in the negative: In a situation such as that in question in the present proceedings, is the first subparagraph of Article 6b(1) of [the Roaming Regulation] in conjunction with the first subparagraph of Article 4(2) of [the Implementing Regulation] applicable by analogy in such a way that a fair use policy can be provided for the tariff option as such? (3) (a) If Question 2(a) or (c) is to be answered in the affirmative: Is the concept of the open data bundle for the purpose of the first subparagraph of Article 6b(1) of [the Roaming Regulation] in conjunction with the first subparagraph of Article 4(2) and Article 2(2)(c) of [the Implementing Regulation] to be interpreted as meaning that a tariff option for which a fee is demanded is to be qualified in itself as an open data bundle? (b) If Question 3(a) is to be answered in the affirmative: In a situation such as that in question in the present proceedings, does this also apply if no fee is demanded for the tariff option? (4) If Question 2(a) or (c) is to be answered in the affirmative and Question 3(a) or (b) is to be answered in the negative: In a situation such as that in question in the present proceedings, is the first subparagraph of Article 6b(1) of [the Roaming Regulation] in conjunction with the first subparagraph of Article 4(2) of [the Implementing Regulation] to be interpreted as meaning that the overall domestic retail price of the mobile communications tariff is also to be used for calculating the volume which must be provided to roaming customers within the scope of a fair use policy based in isolation on the tariff option as such?’