Frontier Communications is a holding company. Through its subsidiaries, the company is a provider of communications services. The company conducts business with both consumer and commercial customers. For consumer customers, the company provides broadband, video, voice and other services and products. The company delivers these services over a combination of fiber and copper-based networks. The company's commercial customers consist of: small, medium and larger enterprise customers, whereby the company provides services including broadband service, Ethernet service, circuit-based services, SD-WAN, and managed Wi-Fi; and wholesale customers, which buy both voice and data services to supplement their own network infrastructure.

T-Mobile US provides mobile communications services, including voice, messaging and data, under its brands, T-Mobile and Metro? by T-Mobile, in the United States, Puerto Rico and the United States Virgin Islands. The company provides mobile communications services using its 4G Long-Term Evolution network and its 5G technology network. The company also provides various wireless devices, including handsets, tablets and other mobile communication devices, and accessories for sale, as well as financing through Equipment Installment Plans and leasing through JUMP! On Demand?. The company provides reinsurance for handset insurance policies and extended warranty contracts offered to its mobile communications customers.