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Nortel Inversora SA engages in telecommunications and basic telephone business. It operates through Fixed Services, Personal Mobile Services and Núcleo Mobile Services segments. The Fixed Services segment offers local are, national long-distance and international communications, supplementary services including call waiting, itemized invoicing, voicemail and others, interconnection with other operators, data transmission such as private networks, point-to-point traffic, radio and television signal transmission, internet services, information technology solution, outsourcing, and sales of equipment. The Personal Mobile Services, and Núcleo Mobile Services segment offers services which include voice communications, high sped mobile internet content and applications download, MMS, SMS, online streaming, corproate e-mail and social network access, among others, as well as sale of mobile communications devices such as handset, tablets, modems, wifi, and wingles. The company was founded on October 31, 1990 and is headquartered in Buenos Aires, Argentina.

Sofora Telecomunicaciones SA operates as a holding company with interest in the telecommunications sector. It provides fixed-line public telecommunication services and basic telephone services through Telecom Argentina SA. The company is headquartered in Buenos Aires, Argentina.