Die Stiftung Warentest kürt das FRITZ!Fon C6 in ihrer aktuellen Ausgabe (test 4/2021) zum Testsieger unter 13 schnurlosen Telefonen. Das FRITZ!Fon C6 erreicht als einziges Telefon eine Eins vor dem Komma: Das Qualitätsurteil lautet „gut (1,9)“.
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