Arcor is the former name of the fixed phone line and Internet business of Vodafone D2 GmbH, a German subsidiary of telecommunications company Vodafone. It is the second-largest provider of fixed phone lines in Germany after Deutsche Telekom. Its name changed on 1 August 2009 after Vodafone completed acquisition of the company. Its headquarters are in Eschborn near Frankfurt. It is one of the few telecommunications companies in Germany to operate an ISDN network that is independent of the incumbent provider Deutsche Telekom.
In 2008 Vodafone Germany had 2.1 million ADSL customers and 1.1 million ISDN customers. Arcor was the first German telecommunications provider to offer a flat rate tariff for ISDN phone lines.
Mannesmann Arcor AG & Co. KG was formed in 1996 as a joint venture between Mannesmann, Deutsche Bank and DBKom, a subsiary of Deutsche Bahn, the national railway operator. After Mannesmann was bought out by Vodafone the company was renamed Arcor AG & Co. KG.
In September 2007 various computer magazines reported that Arcor was blocking access to a small number of pornography sites such as YouPorn for their domestic Internet users. Technology news website Heise Online reported that a competing Internet pornography business had advised Arcor that the blocked sites were illegal under German law as they had either no or inadequate measures to verify the age of people accessing their content.
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- "Vodafone übernimmt Arcor vollständig" (in German). Deutscher Depeschendienst. 19 May 2008. Retrieved 2008-09-02.
- "Acquisition of Minority Interests in Arcor". Vodafone. 2008-05-19. Retrieved 2009-05-31.
- "Arcor sperrt Zugriff auf Porno-Seiten" (in German). Heise Online. 2007-09-10. Retrieved 2008-09-02.