TELECOM ARGENTINA-STET-FRANCE TELECOM S.A. and TELEFÓNICA de ARGENTINA S.A. the telephone companies set up with the privatization of ENTEL de Argentine state telephone company, introduced in Argentina the use of telephone cards as part of the modernization of the old public telephone system. Later these cards were also introduced by PROVINOX S.A. for its "POPI"system applied in several telephone cooperative societies in this country; by COTEL from Villa Gesell, Buenos Aries Province; by COMPAÑÍA DE RADIOCOMUNICACIONES MOVILES S.A. for its Movicom wireless public telephone system; by TELECOMUNICACIONES INTERNACIONALES de ARGENTINA TELINTAR S.A. for prepaid calling cards to phone Argentina from abroad, and by TELECARD, also prepaid calling cards for travellers abroad.