Telefonaktiebolaget LM Ericsson engages in the provision of telecommunications equipment and related services to mobile and fixed network operators. It operates through the following segments: Networks, Digital Services, Managed Services, and Emerging Business and Other. The Networks segment supports all radio-access technologies and offers hardware, software and related services for both radio access and transport. The Digital Services segment provides software and services in the areas of digital business support systems, operational support systems, cloud communication, cloud core, and cloud infrastructure. The Managed Services segment includes networks and information technology managed services, network design and optimization, and application development and maintenance. The Emerging Business and Other segment encompasses emerging business, Iconectiv, Red Bee Media, and Media Solutions. The company was founded by Lars Magnus Ericsson in 1876 and is headquartered in Kista, Sweden.

Alcatel-Lucent SAS engages in the provision of communications solutions to telecommunications companies, Internet service and data providers. It develops and integrates technologies, applications and services to offer global communications services. The company was founded in 1976 and is headquartered in Boulogne-Billancourt, France.

3G Licensing SA, part of Sisvel International SA, is a Luxembourgish company located in Luxembourg. The firm provides wireless transmission telecommunication services. It was founded in 2015.

Designs and builds a wide range of public and private networks, communications systems and software, and data networking systems, as well as telephone systems and microelectronic components

Nortel Networks has hung up on the telecom sector. Once one of the largest makers of telecommunications equipment in North America, it filed for bankruptcy protection in 2009 and is in the process of liquidating its assets. The company made core network switching, wireless, and optical systems for network operators. Its wireline and enterprise network equipment included systems for digital voice and data switching, routing, and call center communications. Wireless products included cellular base stations and controllers. The company also made such long-haul fiber-optic products as multiplexers. Nortel is currently focused on selling off its remaining businesses and intellectual property and winding down all operations. Today, Nortel's Metro Ethernet Networks segment provides carrier Ethernet switching, optical networking, and multi-service switching products.

AT&T Inc. is an American multinational conglomerate holding company headquartered at Whitacre Tower in Downtown Dallas, Texas. It is the world's largest telecommunications company, the largest provider of mobile telephone services, and the largest provider of fixed telephone services in the United States through AT&T Communications. Since June 14, 2018, it is also the parent company of mass media conglomerate WarnerMedia, making it the world's largest media and entertainment company in terms of revenue. As of 2018, AT&T is ranked #9 on the Fortune 500 rankings of the largest United States corporations by total revenue.

Expanding 4.5 million fixed lines to 20 million in just 12 years, kt introduced universal telephone service to every citizen of Korea, leading the development and advancement of communications services. More recently, kt established an advanced broadband network for the first time in Asia, and launched Korea's first communication satellite 'Mugunghwa (Sharon's Rose)', contributing to making Korea one of the most advanced countries in information and communications. Since becoming a government-funded corporation in 1997, kt changed its business portfolio to focus more on wireless and internet services instead of fixed lines. Taking over Hansol M.com and merging with its subsidiary KTF, kt expanded its business scope and included mobile communication as its main service. kt became a privately owned company in 2002 and began concentrating on building broadband network. As a result, the company set several new records including the increase of ADSL subscribers to 6 million in just 3 years and played a leading role in the age of digital networking.

Terraplay Systems operates a global gaming network. It enables game publishers and developers, network operators, and service providers to offer games to a global gaming community and deliver gaming services across various channels. The company provides services, which include mobile storefronts, content download, gaming community, in-game payments, and multiplayer; and white label community sites, billing, and community wrappers. It also offers game developer training, support, consultancy, testing, network and handset knowledge, and tools services. The company was founded in 2000 and is based in Solna, Sweden.

Bridge Technologies Co. AS provides digital television monitoring solutions. Its products include pocket probe, micro Analytics, objective QoE, VB1, VB2, and VB3 series, RF interfaces, intelligent redundancy and server systems. The company was founded by Simen K. Frostad in May 2004 and is headquartered in Oslo, Norway.

AVL is the world's largest privately owned and independent company for the development of powertrain systems with internal combustion engines as well as instrumentation and test systems. AVL is acting in the following scopes of business: Development of Powertrain Systems: AVL develops and improves all kinds of powertrain systems and is a competent partner to the engine and automotive industry. Simulation: In addition AVL develops and markets the simulation methods which are necessary for the development work. Engine Instrumentation and Test Systems: The products of this business area comprise all the instruments and systems required for engine and vehicle testing.

Broadcom Corp. designs, develops and supplies semiconductors for wired and wireless communications. The company was founded by Henry T. Nicholas III and Henry Samueli on August 16, 1991 and is headquartered in San Jose, CA.

Part of Verizon Communications, Inc., MCI Communications Corp. is an American company located in Washington, DC, that provides telecommunications services. MCI, Inc. acquired MCI Communications Corp. on September 15, 1998 for $42,459.16 million.

Spike Broadband Systems, Inc., part of REMEC, Inc., is a company headquartered in Nashua, NH, that develops, manufactures, and sells broadband wireless communications products and services. REMEC, Inc. acquired Spike Broadband Systems, Inc. on January 22, 2002 for $4 million.