Oi is an integrated telecommunication service provider in Brazil, offering "quadruple play" telecommunication services in Brazil. Co. offers a range of integrated telecommunication services that includes fixed-line and mobile telecommunication services, data transmission services (including broadband access services), ISP services and other services for residential customers, small, medium and large companies, and governmental agencies. Co. provides telecommunication services in Region I, Region II and mobile telecommunication in Region III in Brazil.