BT is a holding company. Through its subsidiaries, Co. is engaged in providing customers with communications and connectivity services. Co. sells fixed-voice, broadband, mobile and TV to UK consumers, with a range of ancillary products and services such as handsets and insurance. For Co.'s UK and global business customers, Co.'s services range from phone and broadband to complex managed networks, IT services and cyber security. Co. also sells wholesale access products and services to UK communications providers. Co.'s retail brands include BT, EE, Plusnet and Openreach.