Court of Justice 20 December 2017, Case C-277/16: Judgment of the Court (Second Chamber) of 20 December 2017 (request for a preliminary ruling from the Sąd Najwyższy — Poland) — Polkomtel sp. z o.o. v Prezes Urzędu Komunikacji Elektronicznej (Reference for a preliminary ruling — Common regulatory framework for electronic communications networks and services — Directive 2002/21/EC — Articles 8 and 16 — Directive 2002/19/EC — Articles 8 and 13 — Operator designated as having significant market power — Price control — Obligations imposed by national regulatory authorities — Obligation to ensure cost orientation of prices — Prices set below the costs incurred by the operator concerned for the provision of voice call termination services on mobile networks — Charter of Fundamental Rights of the European Union — Article 16 — Freedom to conduct a business — Proportionality)

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