Oi S.A. is a telecommunications service provider in Brazil, offering a comprehensive range of services that include mobile and fixed-line telephony, broadband internet, and data transmission solutions. The company is well-known for its extensive network infrastructure, which facilitates reliable communication and connectivity throughout the country. Oi also provides ICT solutions for businesses, aiming to support digital transformation across various sectors. The company's official website, https://oisolucoes.com.br/, offers detailed information about its products, services, and customer support options.