Volker Ruloff

1&1 Versatel GmbH engages in the provision of telecommunication services for small, medium-sized, and large enterprises, public institutions, communities, and municipal companies. It offers telephone, Internet, mobile, hosting, voice and site networking, personal consulting, email and web protection services. The firm also manages and develops a fiber network infrastructure. The company was founded in 1999 and is headquartered in Berlin, Germany.

Arcor AG & Co. KG provides telecommunications services. It develops and supplies integrated circuits and system software for wireless voice and data communications, multimedia functions and global positioning. The firm offers internet security, information, network connectivity and interoperability, content and application and billing and payment services. The company was founded in 1998 and is headquartered in Eschborn, Germany.

Mannesmann Eurokom offers telecommunications services.

Vodafone GmbH provides wireless telecommunications services. It also provides software on mobiles according to client specifications. The firm also provides terminal, service and system technology tests to the testing of new applications developed for specific customers. The company was founded in 1990 and is headquartered in Düsseldorf, Germany.

Vodafone GmbH provides telecommunications services. The company offers wireless services including mobile Internet access and access to the Vodafone live! mobile portal service. It has operations in German cities and markets its products and services through branch retail locations through out the country. Vodafone was founded in 1989 and is headquartered in Dusseldorf, Germany.