Oi SA engages in the provision of telecommunications utility services. It offers mobile, broadband, pay television, data transmission, and internet provider services. It operates through the following segments: Residential Services, Personal Mobility, andB2B Services. The Residential Services focuses on the sale of fixed telephony services including voice services, data communication services, and pay TV. The Personal Mobility segment offers mobile telephony services to subscription and prepaid customers, and mobile broadband customers. The company was founded on November 27, 1963 and is headquartered in Rio de Janeiro, Brazil.