AT&T

FiberTower Corporation is a provider of facilities-based backhaul services to wireless carriers across the United States. The company specializes in the transport of voice, video, and data traffic from mobile base stations to mobile switching centers using a combination of wireless spectrum assets and fiber-optic relationships. FiberTower constructs and operates high-capacity hybrid microwave and fiber networks, offering diverse transport solutions based on protocols such as time division multiplexing, SONET, and Ethernet. As of early 2011, the company served over 6,000 billing customer locations across 13 markets, including major cities like Atlanta, Chicago, and New York. FiberTower is recognized as a leader in millimeter band fixed wireless technology, often referred to as "wireless fiber," and it provides spectrum leases along with backhaul and equipment services in its licensed areas. The company maintains strong relationships with mobile carriers and various industry stakeholders and engages in significant research and development initiatives. Headquartered in San Francisco, FiberTower operates as a subsidiary of AT&T Mobility Spectrum LLC.

Carrier IQ is a mobile service intelligence platform that specializes in diagnostic analysis for smartphone users, catering to original equipment manufacturers (OEMs) and wireless carriers. The company offers a device designed to measure key parameters of service quality and usage, enabling customers to analyze detailed usage scenarios and fault conditions based on type, location, application, and network performance. By focusing on the mobile experience delivered at the handset level, Carrier IQ provides valuable insights that go beyond the state of network components, allowing clients to better understand and enhance the user experience.

Blue Danube Systems designs next-generation wireless solutions for mobile networks and other applications. Its Coherent Massive MIMO solution brings 5G beamforming to today’s networks dramatically increasing network capacity and end-user experience. It was founded in 2006 and headquartered in Santa Clara, California.

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 wireless communications provider in the United States, operating under the Cricket brand. The company specializes in offering unlimited wireless voice and data services for a flat rate, without requiring long-term contracts or credit checks. Serving over 5.3 million customers across 35 states and the District of Columbia, Cricket has established itself as a pioneer in affordable unlimited wireless services. Its offerings include nationwide voice plans featuring unlimited anytime minutes, long-distance calling, text and picture messaging, as well as unlimited Mobile Web access and various calling features. Additionally, Cricket Broadband provides unlimited Internet access with speeds comparable to DSL. Headquartered in San Diego, California, Leap Wireless operates in major U.S. markets and maintains a strong presence throughout the country from New York to California.

picoChip specializes in signal processing products tailored for wireless telecommunications systems. The company is known for its multi-core digital signal processors (DSP) and software-defined radio products, which are widely implemented in the industry. Additionally, picoChip is expanding its portfolio to include a variety of application-specific standard products (ASSP) that are optimized for both cost and performance, enhancing its offerings in the wireless communication market.

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

OmniSky Corporation was a developer and provider of wireless data applications and services for mobile device users. Prior to its bankruptcy filing in January 2002, the company served a range of clients, including wireless carriers, hardware manufacturers, and content providers. It specialized in delivering innovative solutions to enhance the use of mobile technology. Following its financial difficulties, OmniSky sold most of its assets to EarthLink, including its subscriber base and intellectual property rights.

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.