Swisscom AG engages in the provision of telecommunication services. It operates through the following segments: Residential Customers, Small and Medium-Sized Enterprises, Enterprise Customers, Wholesale, and IT, Network & Innovation. The Residential Customers segment comprises mainly connection fees for broadband and TV services, fixed-network and mobile phone subscriptions as well as national and international telephone, and data traffic for residential customers. The Small and Medium-Sized Enterprises segment involves connection fees for broadband services, fixed-network, and mobile phone subscriptions as well as national and international telephone and data traffic for small and medium-sized enterprises. The Enterprise Customer segment focuses on complete communication solutions for large business customers. The Wholesale segment uses the Swisscom fixed and mobile networks by other telecommunication service providers and the use of third-party networks by Swisscom. The IT, Network & Innovation segment is responsible primarily for the planning, operation and maintenance of the Swisscom's network infrastructure and all IT systems. The company was founded in 1852 and is headquartered in Worblaufen, Switzerland.