(Cases С-280/08 Deutsche Telekom and С-52/09 TeliaSonera)   Hristo Kirilov [1]   Based on the judgments of the Court of Justice of the European Unionfrom 14 October 2010 in case C‑280/08 P Deutsche Telekom AG and from 17 February 2011 in case C‑52/09 TeliaSonera Sverige AB, this paper aims at giving a comprehensive description of the “margin…