American Tower is a holding company. Through its subsidiaries, the company is a real estate investment trusts and an independent owner, operator and developer of multitenant communications real estate. The company's primary business is the leasing of space on communications sites to wireless service providers, radio and television broadcast companies, wireless data providers, government agencies and municipalities and tenants in a number of other industries. The company also provides tower-related services, including site acquisition, zoning and permitting and structural analysis, which primarily support the company's site leasing business, including the addition of new tenants and equipment on its sites.

NTT DOCOMO is a mobile telecommunications carrier. Co. has three operating segments. The telecommunications segment includes mobile phone services (LTE(Xi) services and FOMA services), optical-fiber broadband service, satellite mobile communications services, international services and the equipment sales related to these services. The smart life segment includes video and music distribution, electronic books and other services offered through DOCOMO's "dmarket" portal, as well as finance/payment services, shopping services and various other services. The others segment primarily includes "Mobile Device Protection Service," as well as development, sales and maintenance of IT systems.

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.

Telefonica is engaged in the provision of public or private telecommunications services, including ancillary or complementary telecommunications services or related services. Co.'s fixed business includes: traditional fixed telecommunication services, Internet and broadband multimedia services, data and business-aplications services, and wholesale services for telecommunication operators. Co. also provides a range of mobile and related services and products to consumer and business customers, including mobile voice services, value added services, mobile data and Internet services, wholesale services, corporate services, roaming, fixed wireless, and, trunking and paging.