Nortel Inversora S.A., through its subsidiary, Telecom Argentina S.A., provides fixed-line public and mobile telecommunication services. It operates through three segments: Fixed Services, Personal Mobile Services, and Núcleo Mobile Services. The company offers local fixed telephony, public telephony, domestic and international long-distance telephony, domestic and international point-to-point link, domestic and international telex, and Internet access services. It also provides value-added services, data transmission, videoconferencing, transportation of audio and video signals, and mobile radio communication services. In addition, the company offers call forwarding, call waiting, three-way calling, itemized billing, voicemail, SMS, GPRS, mobile Internet, and other miscellaneous cellular services; provides international wholesale services; and sells equipment. It operates in Argentina, Paraguay, and the United States. The company was founded in 1990 and is based in Buenos Aires, Argentina.