Judgment of the Court (Eighth Chamber) of 3 September 2020.#Bundesverband der Verbraucherzentralen und Verbraucherverbände - Verbraucherzentrale Bundesverband eV v Telefónica Germany GmbH & Co. OHG.#Request for a preliminary ruling from the Landgericht München I.#Reference for a preliminary ruling — Roaming on public mobile communications networks within the European Union — Regulation (EU) No 531/2012 — Article 6a — Article 6e(3) — Roaming provider required to automatically apply the regulated roaming tariff — Application to consumer having opted for a specific roaming tariff prior to the entry into force of Regulation (EU) No 531/2012.#Case C-539/19.