Telephone and Data Systems, Inc., a telecommunications company, provides wireless, wireline, cable, and hosted and managed services in the United States. The company offers cellular services, such as postpaid national plans and prepaid service plans with voice, messaging, and data usage options; and business rate plans. It also offers wireless devices comprising handsets, tablets, mobile hotspots, home phones, and routers; and including accessories, including wireless basics, such as cases, screen protectors, chargers, and memory cards, as well as an assortment of consumer electronics comprising headphones, speakers, wearables, and home automation products. In addition, the company provides wireline and cable broadband services; digital television (TV) and digital satellite TV video services; voice services comprising local and long-distance telephone, voice over Internet protocol, find me follow me, collaboration, instant messaging, and other services; and network access services. Further, it offers a range of information technology (IT) services, including colocation, cloud and hosting solutions, managed services, and enterprise resource planning application management services; sells IT hardware, as well as provides related maintenance and professional services; and engages in planning, engineering, procurement, sale, installation, and management of IT-infrastructure solutions. Additionally, the company operates retail stores and kiosks. The company serves approximately 5.1 million wireless customers and 1.2 million wireline and cable customers. Telephone and Data Systems, Inc. sells its products through retail sales, direct sales, third-party retailers, and independent agents, as well as through Website and telesales. The company was founded in 1968 and is headquartered in Chicago, Illinois.