In a judgment of 1 July 2010 (C-99/09 Polska Telefonia Cyfrowa), the European Court of Justice of the European Union (ECJ) has further clarified the pricing principles with respect to the portability of telephone numbers between communications networks. This ruling constitutes a welcome complement to the Court's existing case law on the topic (Case C-438/04 Mobistar [2006] ECR I-6675).

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