Christian P. Illek

T-Mobile USA, Inc. engages in the provision of wireless voice, messaging, and data services. It offers different plans for phones and tablets. The company was founded by John W. Stanton in 1994 and is headquartered in Bellevue, WA.

T-Mobile International AG & Co. KG provides telecommunications services. As strategic business segment of Deutschen Telekom AG for mobile telephony, the company concentrates on mobile telephony markets in Europe and the USA. The company is a partner of the FreeMove alliance, which they founded together with three other european mobile phone providers: Orange, Telefónica Móviles Espana and TIM (Telecom Italia Mobile). The company was founded in 1999 and is headquartered in Bonn, Germany.

T-Systems International GmbH engages in the development, implementation, operation, and marketing of client- and industry-specific solutions in the information processing and telecommunications sectors. These include security, data processing, information management, training, and consulting services. The company was founded on August 30, 2004 and is headquartered in Frankfurt, Germany.

Microsfot Deutschland GmbH is a distributor of software products. It offers operating systems for computers and mobile phones, cloud services, and programming services. The company was founded in 1983 and is headquartered in Unterschließheim, Germany, with offices within the country.

Drawing on a global infrastructure of data centers and networks, T-Systems operates information and communication technology (ICT) systems for multinational corporations and public sector institutions. On this basis, the company provides integrated solutions for the networked future of business and society. T-Systems combines industry expertise and ICT innovations to add significant value to customers' core business all over the world.

Telekom Deutschland GmbH provides mobile communication services. It offers fixed network telephony, broadband Internet, mobile voice and data, and IPTV products and services. The firm's technologies for mobile data transmission include GPRS, EDGE, W-LAN, UMTS, and HSDPA. The company was founded in 1993 and is headquartered in Bonn, Germany.

Buyin SA is a Belgian procurement company that specializes in telecommunications industry. Buyin is based in Brussels, BE. The private company provides technical consultancy with commercial cost insights and leverage scale and innovation across all the strategic telco product categories. The company creates solutions to increase competitiveness on the basis of a demand plan and in constant interaction with their customers. The company has a proven track of building strong long-term relationships with suppliers and partners. Béatrice Felder has been the CEO of the company since 2019.