Oliver Zweifel

debitel AG provides mobile & fixed-line telecommunications services, internet and data services. It is a network-independent telecommunications company that offers mobile telephony, fixed-line telephony and the internet. It does all of this by purchasing capacity from various network operators, which it then supplements and combines to create its own products and packages. It works in Germany with the mobile telephony operators like T-Mobile, Vodafone and E-Plus. The company was founded in 1991 and is headquartered in Stuttgart, Germany.

European Computer Telecoms AG provides soft switching and value added telecommunication services. It offers public switching, service nodes, intelligent networks, intelligent peripherals, and networks based on the internet protocol. The firm’s services include free-phone and premium-line service numbers, ring back tone application, teleconferencing services, personal number services, virtual call centers, and prepaid services. The company was founded by Marshall E. Kavesh, Hans Huber and Walter Rott in 1998 and is headquartered in Munich, Germany.

Zweiga Holding AG operates as a holding company. The firm acquires and manage shares and other business interests. The company is headquartered in Tuggen, Switzerland.