 Brazilian telecom Oi SA ended exclusive negotiations on Monday with Highline do Brasil, a portfolio company of U.S. private equity firm Digital Colony, for the sale of its mobile assets, a source familiar with the matter said. Highline presented the best bid for Ois mobile unit on July 18, which had a minimum value established by the Brazilian telecom firm of 15 billion reais 2.86 billion. Four days later, however, telecoms operators TIM Participacoes, Telefonica Brasil SA and America Movil SAB de CVs Claro submitted a joint 16.5 billion reais 3.15 billion new bid for Ois mobile assets, higher than Highlines offer. 