Case C-468/20, Fastweb and Others (Time frame for billing): Judgment of the Court (First Chamber) of 8 June 2023 (request for a preliminary ruling from the Consiglio di Stato — Italy) — Fastweb SpA, TIM SpA, Vodafone Italia SpA, Wind Tre SpA v Autorità per le Garanzie nelle Comunicazioni (Reference for a preliminary ruling — Electronic communications networks and services — Directives 2002/19/EC, 2002/20/EC, 2002/21/EC and 2002/22/EC — Article 49 TFEU — Freedom of establishment — Article 56 TFUE — Freedom to provide services — National legislation granting the national regulatory authority the power to impose on telephony service providers a minimum time frame for the renewal of offers and a minimum time frame for billing — Consumer protection — Principle of proportionality — Principle of equal treatment)