mobilezone holding ag is a telecommunications company, which engages in the provision of mobile and fixed-line telephony. It operates under the Switzerland and Germany segments. The Switzerland segment includes mobilezone ag, IT Business Services GmbH, TalkTalk AG, mobilezone reload ag, and Digital Republic AG. The Germany segment is involved in mobilezone Deutschland GmbH, mobilezone handel GmbH, mobilezone GmbH, powwow Berlin GmbH, and SIGA exchange GmbH. The company was founded in 1990 by Rudolf Baer and Martin Lehmann in 1999 and is headquartered in Rotkreuz, Switzerland.