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Part of Deutsche Telekom AG, T-Systems Malaysia Sdn. The company is based in Cyberjaya, Malaysia. Bhd. is a Malaysian company that provides integrated and secure network, cloud, Salesforce, and SAP solutions to help businesses on their road to digitalization. T-Systems offers Secure Access Service Edge (SASE) to provide secure networks, high connectivity, and quick cloud access for companies. The company also partners with leading technology and software enterprises to provide the best solutions for their clients. Additionally, T-Systems offers an Intrusion Detection System (IDS) that checks data traffic within vehicles for anomalies.

Part of Deutsche Telekom AG, T-Mobile Global Holding GmbH is a German company that provides radiotelephone communications services. The company is based in Bonn, Germany and was founded in 2003.

Operational Services GmbH & Co. KG is an information technology services provider. The joint venture company is based in Frankfurt, Germany. Frank Oidtmann has been the CEO of the German company since 2005.

T-Systems Singapore Pte Ltd. provides telecommunication and consulting services. It serves the telecommunications, manufacturing, finance, retail, government, health care, oil and gas and transportation industries. The company is headquartered in Singapore

Engineering.mo SpA provides information and communications technology solutions. The company is headquartered in Rozzano, Italy.

Detecon International GmbH provides management consulting services. It advises telecommunications companies, governments, investors and regulatory authorities with solutions developed from the application of information and telecommunications technologies. The company was founded in 1977 and is headquartered in Cologne, Germany.

ClickandBuy International Ltd. provides electronic money transfer services. It also provides internet payment billing systems. The company was founded by Norbert Stangl in 1999 and is headquartered in England, the United Kingdom.

Telekom Innovation Pool GmbH provides venture and growth capital for companies that operate in such fields as telecommunication, information technologies, multimedia and develop technologies that are in line with Deutsche Telekom AG's strategy.

Founded in 1999, Deutsche Telekom IT GmbH is a German software development company that develops software applications. The company is based in Bonn, Germany and is a subsidiary of Deutsche Telekom AG.

Combis consults, develops, implements, integrates & maintains complete, complex and sophisticated information-application-communication turn-key solutions. COMBIS is woven from hardworking, talented people and high technologies. They have crossed a long way of continuous growth and progress from the beginnings, when one enthusiast 19 years ago formed a company that has become the leading Croatian system integrator. Their development has always been based on the freedom of thought, innovation & creativity, stimulating at the same time teamwork & friendship among employees, as the main driver of their business. Moreover, technologies that they develop and implement are enriched with human factor and knowledge, making all the difference. Thus, technology truly becomes a living component of success and development of its customers.

Part of Deutsche Telekom AG, CTA Holding GmbH is a German company that provides equity investment and management services. The company is based in Bonn, Germany. The company was founded in 2012. The CEO is Carsten Veltn Velten.

Part of Deutsche Telekom AG, Deutsche Telekom Global Business Solutions UK Ltd. is a company that provides telecommunication and information technology services. The company is based in Tilbrook, UK.

Part of Deutsche Telekom AG, Satellic NV is a toll operator in Belgium. The company is based in Diegem, Belgium. Satellic has designed, built, financed, and made operational a complete kilometre charging system using satellite positioning technology (GNSS) together with mobile (GSM) and dedicated short-range communication (DSRC). The Belgian company has more than 600,000 active OBUs installed in trucks coming from 100 different countries. Satellic offers numerous advantages to its clients, including fleet invoice, free 24/7 customer support, more than 120 service points, and free tools such as the journey visualization. Founded in 2014, the company was appointed by the three Belgian Regions to collect toll from Heavy Goods Vehicles of over 3.5 tonnes and from N1 BC vehicles.

Iskon Internet dd engages in the provision of telecommunication services. It also offers representation, accounting, and projection services. The company's products are Internet, television, mobile phones, and smart watches. Iskon Internet was founded by Damir Sabol on September 22, 1995 and is headquartered in Zagreb, Croatia.

Part of Deutsche Telekom AG, SprintLink India Pvt Ltd. is an Indian company that operates communications networks. The company is based in Mumbai, India and was founded in 2003.

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.

Part of Deutsche Telekom AG, Software Daten Service GmbH develops software for the banking industry. The company is based in Vienna, Austria. Ernst Kendlbacher has been the CEO of the Austrian company since 2011.

Sprint/United Management Co., Inc. provides management services. The company is headquartered in Overland Park, KS.

Part of Deutsche Telekom AG, Sprint Telecom India Pvt Ltd. is an Indian telecommunications company. The company is based in Mumbai, India. Founded in 2011, Sprint Telecom India provides telecommunications services.

Deutsche Telekom Venture Funds GmbH is venture capital fund that invests in early stage companies.

T-Mobile Polska SA engages in the operation of mobile phone networks. It also offers telephones, routers, modems, tablets, and computers. The company provides caller identification, hotspot, high definition voice and Internet services. T-Mobile Polska was founded in 1995 and is headquartered in Warsaw, Poland.

Toll4Europe GmbH engages in the development, construction, and operation of electronic toll service facilities for the billing of toll charges for vehicles. It also provides toll-related and other value-added services for contract partners and end users. The company was founded on March 3, 2016 and is headquartered in Berlin, Germany.

T-Systems SASU provides digital infrastructure services. It offers solutions for cloud, network, security, quality, automotive, and outsourcing. The firm caters to the bank, automobile, insurance, and retirement sectors. The company was founded on August 5, 1980 and is headquartered in Saint-Denis, France.

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.

Deutsche Telekom (UK) Ltd. specializes in the development and support of products and services for telecommunications operators. It combines technical and commercial know-how from all over the world and supports the international activities. The company is headquartered in London, the United Kingdom.

Part of Deutsche Telekom AG, DTCP NL II cv functions as an investment holding company. The company is based in Maastricht, Netherlands.

T-Mobile Czech Republic a.s. provides telecommunications services. The company offers mobile telecommunication services, internet, television, mobile phones, tablets, laptops and modems. The company was founded on February 15, 1996 and is headquartered in Prague, Czech Republic.

Part of Deutsche Telekom AG, Deutsche Telekom Europe BV is a holding Dutch company with interests in mobile phone telecommunications services. The company is based in Maastricht, Netherlands.

Part of Deutsche Telekom AG, T-Systems Information & Communication Technology India Pvt provides information and communications technology services. The company is based in Pune, India.

Slovak Telekom, a.s. provides telecommunication services to residential and corporate clients in Slovakia. It offers a range of services, including voice and data services through landline and mobile telecommunication networks, Internet connectivity, digital TV services, MMS messaging services, and roaming services. Slovak Telekom was founded on April 1, 1999 and is headquartered in Bratislava, Slovakia.

OTE Plc provides interest bearing loans. It raises bonds and loans from the market. The company was founded on December 17, 1999 and is headquartered in London, the United Kingdom.

Part of Deutsche Telekom AG, DFMG Holding GmbH provides management services. The company is based in Bonn, Germany. The German company was founded in 1999. The CEO is Dhananjay Mirchandani.

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.

CE Colo Czech s.r.o. provides state-of-the-art carrier neutral data center services. Its services include colocation, remote hands, connection and other services. The company was founded in January 2011 and is headquartered in Prague, Czech Republic.

Part of Deutsche Telekom AG, T-Systems México SA de CV is a global leader in IT and digital services. The company is based in Cuautlancingo, Mexico. T-Systems provides integrated and secure solutions for network, cloud, Salesforce, and SAP to help businesses on their path to digitalization. The Mexican company's experts specialize in digitizing information and document management for companies. Additionally, T-Systems offers solutions that enhance the customer experience throughout the automotive value chain. With offices in over 20 countries and approximately 28,000 employees worldwide, T-Systems is a trusted partner for businesses seeking innovative IT and digital services.

T-Systems Multimedia Solutions GmbH provides digital solutions and web innovations services. It specializes in digital transformation, industry 4.0 and Internet of Things, business solutions, IT security, IT management, IT quality, digital commerce, digital marketing, and digital service. The company is headquartered in Dresden, Germany.

T-Systems Ltd. operates information and communication technology systems for multinational corporations and public sector institutions. It delivers its customers end-to-end information and telecommunications solutions from corporate voice and data networks to full-spectrum business process outsourcing. The firm also provides document, security, customer relationship management and desktop services. The company is headquartered in London, the United Kingdom.

T-Systems ITC Iberia provides IT and telecommunications solutions and services for the automotive, banking, health, and public sectors. These include systems integration and engineering, as well as infrastructure management and process modernization. The firm is based in Barcelona, Spain.

Part of Deutsche Telekom AG, T-Systems do Brasil Ltda. provides integrated and secure network, cloud, sales force, and SAP solutions to help companies on their path to digitalization. With legacy systems still being a part of a Brazilian company's IT, hosting can be done on-premises or in the provider's data center. T-Systems has units in over 20 countries and approximately 28,000 employees (2020), making it one of the largest IT service providers and digital service suppliers. The company leverages artificial intelligence, internet of things, cloud, 5G, and operations control systems to make transportation processes for long and short distances, as well as airports, smarter.