AT&T

Carbyne provides a cloud-native, mission-critical contact center solution and real-time emergency communication platform for public safety and enterprise use. The company operates as a rich-data provider for mission-critical centers, collecting hundreds of millions of data points annually in a unified platform and enabling secure, direct connections between callers, connected devices, and emergency centers without requiring a consumer app. Its platform supports encrypted video, voice, images, chat, and precise device-based location, helping emergency call takers analyze calls in real time, improve call-center efficiency, lower dispatch times, and deliver faster, more accurate responses to incidents across governments, enterprises, and individuals.

AST SpaceMobile develops and manufactures satellites for a global broadband cellular network in space. This network directly connects with standard, unmodified mobile devices, aiming to eliminate connectivity gaps and bring broadband to the billions currently unconnected.

Lumina Networks, Inc. specializes in designing and developing open-source networking solutions aimed at simplifying and automating diverse network environments. Founded in 2017 and headquartered in San Jose, California, with additional offices globally, the company offers a range of products including the Lumina extension adaptation platform, Lumina SDN controller, and Lumina network resource manager. Lumina is committed to transforming how communication service providers utilize open-source platforms, enabling them to regain control over their network development and deployment. The company's solutions encompass network visibility, software-defined data centers, SD-Core, and internet-based service automation, facilitating a customer-centric approach to delivering customizable services. By leveraging open-source technologies, Lumina Networks empowers service providers to implement production-ready, intent-driven networking without vendor lock-in, fostering innovation and agility in their operations.

FiberTower Corporation is a provider of facilities‑based backhaul services to wireless carriers across the United States. The company constructs and operates high‑coverage, high‑capacity hybrid microwave and fiber networks, leveraging its spectrum assets and fiber relationships. It delivers transport services using protocols such as time division multiplexing, SONET, and Ethernet. FiberTower also specializes in millimeter‑band fixed wireless technology, leasing spectrum in the 24 GHz and 39 GHz bands for small‑cell and macro‑cell backhaul solutions. The firm serves thousands of customer locations in major markets including Atlanta, Boston, Chicago, Cleveland, Dallas/Fort Worth, Denver, Detroit, Houston, New York/New Jersey, Pittsburgh, San Antonio/Austin/Waco, Washington DC/N. Virginia/S. Maryland, and West Florida. It collaborates with carriers, equipment providers, and deployment partners on research and development initiatives. FiberTower Corporation is headquartered in San Francisco.

Carrier IQ is a mobile service intelligence platform that specializes in providing diagnostic analysis for smartphone users, primarily serving original equipment manufacturers (OEMs) and wireless carriers. The company offers a device that measures critical parameters of service quality and usage, enabling customers to conduct in-depth analyses of various usage scenarios and fault conditions. This analysis includes detailed insights based on type, location, application, and network performance, allowing for a comprehensive understanding of the mobile experience as perceived at the handset level, rather than merely assessing the network infrastructure. Through its services, Carrier IQ aims to enhance the overall quality of mobile services.

Blue Danube Systems, Inc. specializes in designing and developing next-generation wireless access solutions that enhance network capacity and quality of service for mobile networks. The company offers innovative products, including high-definition active antenna systems that integrate advanced hardware and intelligent software to optimize existing infrastructure, thereby improving the user experience. One of its notable offerings is BeamMaster, a platform focused on real-time user traffic detection and hotspot pattern recognition. Founded in 2006, Blue Danube Systems is headquartered in Mountain View, California, with an additional office located in Warren, New Jersey. The company engages in strategic collaborations to further its mission of advancing telecommunications technology.

Nextel Mexico offers its users with wireless communications services. The company is an analog specialized mobile radio operator that offers mobile radio voice, messaging, and data services for individuals and businesses. Nextel Mexico was founded in 1993 and it was acquired by AT&T on January 27, 2015.

Iusacell is a prominent provider of wireless telecommunications and cellular services in Mexico. The company made history by being the first to introduce mobile phone services in the country and later pioneered the launch of 3G technology and mobile Internet broadband. Currently, Iusacell is recognized as the first mobile phone company in Mexico to provide 4G network services. It offers a comprehensive range of mobile telephony services, including postpaid and prepaid plans, long-distance calling, paging, data transmission, and roaming services. Iusacell boasts national coverage and integrates the only two providers of wireless communication services in Mexico using CDMA technology, optimizing the efficiency of radio spectrum use.

Alltel is a telecommunications company based in Rockport, Texas, that offers a wide range of wireless communication services and products for both consumers and businesses. It serves various industries, including transportation, retail, insurance, healthcare, construction, and financial services. Alltel's offerings encompass wireless voice and data communication, postpaid and prepaid calling options, roaming and long-distance services, and diverse data solutions. The company provides additional services such as text and video messaging, digital gaming, radio streaming, internet access, and email. It also delivers business intelligence, field service automation, security, and systems management solutions, along with mobile handsets and accessories. As a subsidiary of Verizon Wireless and AT&T, Alltel plays a significant role in the telecommunications landscape in North America and the Caribbean.

Leap Wireless is a San Diego-based provider of digital wireless services operating under the Cricket brand. It offers unlimited voice and data plans without fixed-term contracts or credit checks, serving over 5 million customers across 35 states and D.C. The company operates on an all-digital 3G CDMA2000 network, offering features like unlimited minutes, texts, mobile web access, and directory assistance.

Superclick is a company specializing in network design, deployment, and infrastructure management, primarily serving the hospitality, healthcare, and multi-dwelling unit (MDU) markets. It offers broadband high-speed internet connection equipment and IP infrastructure management systems, ensuring reliable connectivity and support. With a commitment to customer service, Superclick provides around-the-clock help desk support to its clients. The company boasts a diverse portfolio, working with prominent hospitality brands such as Fairmont & Raffles Hotels, Four Seasons Hotels, Intercontinental Hotels Group, Jumeirah, Kimpton Hotels, Mandarin Oriental Hotels, Marriott Hotels International, Shangri-La Hotels, and Starwood, with operations spanning Canada, North America, the Middle East, and Asia.

picoChip specializes in signal processing products designed for wireless telecommunications systems. The company develops multi-core digital signal processors (DSPs) and has a notable portfolio of software-defined radio products that are widely utilized in the industry. Additionally, picoChip is expanding its offerings to include a range of application-specific standard products (ASSPs) that are optimized for both cost and performance, catering to the evolving needs of wireless communication technologies.

Edge Wireless LLC is a company that was acquired by AT&T in 2008.

Dobson Fiber operates a high-speed fiber-optic network that delivers reliable communication services, including voice and data transfer. The company is dedicated to providing dependable technology solutions tailored to meet the diverse needs of businesses. With a focus on scalability and customization, Dobson Fiber ensures that its clients receive the necessary bandwidth and technology to maintain seamless connectivity. The company's commitment to safe and efficient communication services positions it as a trusted provider in the industry, catering to organizations seeking robust internet and cloud access solutions.

Interwise is a company that specializes in providing voice, web, and video conferencing solutions tailored for enterprises. Established in 1994 and headquartered in Cambridge, Massachusetts, Interwise serves a diverse range of industries, including technology, manufacturing, pharmaceuticals, insurance, automotive, and retail. Its primary product, AT&T Connect, is an IP-based software designed for facilitating voice conferences, web meetings, virtual training sessions, web seminars, webcasts, and recordings. In addition to its headquarters, Interwise maintains operations in several countries, including Israel, Japan, the United Kingdom, Switzerland, France, and Germany, thereby extending its global reach in delivering innovative communication solutions.

BellSouth Corporation is an American telecommunications company and a subsidiary of AT&T. BellSouth was one of the original Bell Regional Operating Companies after the U.S. government forced the American Telephone & Telegraphic Company to divest itself of regional telephone companies. The company provided its services to the southern parts of the U.S. and has its headquarters in Atlanta, Georgia. BellSouth also operated an advertising and publishing unit, which printed and distributed phone books and directories. BellSouth was acquired by AT&T in 2006 in a deal worth US$ 86 billion.

Telecorp PCS is a telecommunication company that provides wireless communication services.

Prodigy Communications Corp., an Internet service provider, serves both owned and managed dial and DSL subscribers. Products and services include Prodigy Instant Messaging™; Prodigy Chat™; Prodigy Online Communities; Prodigybiz, a suite of specially designed Internet products and services for small business owners; and Prodigy® En Espanol™, a bilingual Spanish/English-language Internet service created especially for the U.S. Spanish-speaking population.

New Global Telecom is a leading provider of telecommunications infrastructure and services, specializing in the development of advanced networks across Latin America and Asia. The company primarily focuses on building direct networks and supplying international telecommunications services to Tier I carriers in the United States and other regions. With a monthly volume exceeding 90 million minutes sold to inter-exchange carriers globally, New Global Telecom has established a significant presence in the market. Additionally, the company leverages its extensive in-house expertise to offer a range of telecommunications management services designed to assist both emerging and established carriers in navigating the complexities of the evolving telecommunications landscape. As a fully integrated global communications provider, New Global Telecom delivers retail and wholesale internet, data, and switched voice services, positioning itself to lead the deployment of converged networks in emerging markets.

OnSite Access is a leading provider of integrated communications services based in New York, specializing in telecommunications for commercial properties. The company focuses on enhancing the communications infrastructure of buildings, offering services such as data applications and broadband networks, including both fiber-optic and copper-based solutions. Operating in 29 markets, OnSite Access has already connected over 350 million square feet of real estate at no cost to property owners. By transforming outdated communication systems into advanced networks, OnSite Access empowers businesses to communicate and collaborate more effectively, fostering growth and competitiveness in the marketplace.

Tellme Networks specializes in voice recognition technology, enhancing how individuals access information via their phones. By integrating Internet data with a voice interface, Tellme enables users to verbally request information, simplifying the search process. The company's platform supports a variety of services, including business and information searches, as well as customer service solutions for major clients such as American Airlines, Merrill Lynch, and FedEx. Tellme's interactive voice response system provides users with access to real-time information on topics like movies, sports, news, stock quotes, and weather. The company caters to diverse industries, including airlines, financial services, healthcare, travel, hospitality, retail, and logistics. Acquired by Microsoft in 2007, Tellme's technology is now incorporated into various Microsoft products, including Windows Phone and Xbox voice recognition systems.

Eureka Broadband, a building-centric application service provider and premium high-speed Internet access company.

Eureka Broadband, a building-centric application service provider and premium high-speed Internet access company.

Tele-Communications was a cable television provider in the United States. It was acquired by AT&T in 1999.

Tut Systems, Inc. delivers advanced content processing and distribution products as well as comprehensive system integration services for deploying next-generation data and video services over broadband networks. Service providers, content providers and government agencies worldwide use Tut Systems solutions to deliver broadcast-quality video over broadband networks.

Alascom, Inc., d/b/a AT&T Alaska, is an Alaskan telecommunications company.

McCaw Cellular provides cellular mobile telephone, paging, conventional mobile phone, and answering services. McCaw Cellular rose with the rest of the cellular telephone industry in the early 1980s and grew rapidly through acquisitions during the decade, taking on enormous debts to do so. In an effort to build a nationwide mobile telephone service, the company assembled a network of cellular properties, which together were dubbed, Cellular One. By the end of 1987, McCaw Cellular had acquired licenses for 94 markets with a combined total of 37 million potential customers, making the enterprise the largest U.S. cellular phone operator. Founded in 1986, McCaw Cellular is based in Redmond, Washington. It was acquired by AT&T in 1994.

Lumen - Mass Markets fiber Business offers fiber internet services to both residential and business customers. The company focuses on providing high-speed connectivity solutions across various regions, catering to the needs of individuals and organizations. Lumen's infrastructure supports a range of applications, enabling users to access reliable internet for work, entertainment, and communication. The business emphasizes expanding its network to enhance service availability and meet growing demand. Through its offerings, Lumen aims to facilitate seamless online experiences for its users.