 Digital Colony, a private equity firm backed by U.S. real estate investor Thomas Barrack and Digital Bridge Holdings, has delivered a bid for the mobile unit of bankrupt Brazilian carrier Oi SA, two sources familiar with the matter said. Focused on investing in digital infrastructure in Canada, Latin America and Europe, Digital Colony is interested in Ois mobile fixed assets, not necessarily in providing telecom services directly to consumers, the sources said. Digital Colony could seek partnerships with other telecoms players to provide them with services using its infrastructure if it proceeds with the deal, which could also involve further asset sales down the road, one of the sources said. 