Exhibit 12.1



CERTIFICATION



June 30, 2004



Securities and Exchange Commission

450 Fifth Street, N.W

Washington, D.C. 20549



Ladies and Gentlemen:



The certification set forth below is being submitted to the
Securities and Exchange Commission solely for the purpose of complying with Section 1350 of Chapter 63 of Title 18 of the United States Code. This certification is not to be deemed filed pursuant to the Securities Exchange Act of 1934 and does not
constitute a part of the Annual Report on Form 20-F (the Report) accompanying this letter.



Carlos Felices, the Chief Executive Officer and Valerio Cavallo, the Chief Financial Officer of Telecom Argentina S.A. (Telecom) each
certifies that, to the best of his knowledge:



| | 1. | the Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and
| | -- | ---------------------------------------------------------------------------------------------------------------------



| | 2. | the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of Telecom.
| | -- | ------------------------------------------------------------------------------------------------------------------------------------------------



/s/ Carlos FelicesName:

Carlos FelicesChief Executive Officer/s/ Valerio CavalloName:

Valerio CavalloChief Financial Officer




A signed original of this
written statement required by Section 906 has been provided to Telecom and will be retained by Telecom and furnished to the Securities and Exchange Commission or its staff upon request.



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CERTIFICATION



I, Carlos Felices, certify that:



|1. | I have reviewed this annual report on Form 20-F of Telecom Argentina S.A.;
|-- | --------------------------------------------------------------------------



|2. | Based on my knowledge, this annual report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light
of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;
|-- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|3. | Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of
operations and cash flows of the registrant as of, and for, the periods presented in this report;
|-- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|4. | The companys other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and
15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the company and have:
|-- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | a) | designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information
relating to the company, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;
| | -- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | b) | designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable
assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;
| | -- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | c) | evaluated the effectiveness of the companys disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls
and procedures, as of the end of the period covered by this report based on such evaluation; and
| | -- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | d) | disclosed in this report any change in the companys internal control over financial reporting that occurred during the period covered by the annual report that has materially
affected, or is reasonably likely to materially affect, the companys internal control over financial reporting; and
| | -- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|5. | The companys other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the companys auditors
and the audit committee of companys board of directors (or persons performing the equivalent functions):
|-- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | a) | all significant deficiencies in the design or operation of internal controls which could adversely affect the companys ability to record, process, summarize and report
financial information and have identified for the registrants auditors any material weaknesses in internal controls; and
| | -- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | b) | any fraud, whether or not material, that involves management or other employees who have a significant role in the companys internal control over financial reporting.
| | -- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------



Date: June 30, 2004



/s/ Carlos FelicesCarlos FelicesChief Executive Officer




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CERTIFICATION



I, Valerio Cavallo, certify that:



|1. | I have reviewed this annual report on Form 20-F of Telecom Argentina S.A.;
|-- | --------------------------------------------------------------------------



|2. | Based on my knowledge, this annual report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light
of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;
|-- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|3. | Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of
operations and cash flows of the registrant as of, and for, the periods presented in this report;
|-- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|4. | The companys other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and
15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the company and have:
|-- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | a) | designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information
relating to the company, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;
| | -- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | b) | designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable
assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;
| | -- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | c) | evaluated the effectiveness of the companys disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls
and procedures, as of the end of the period covered by this report based on such evaluation; and
| | -- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | d) | disclosed in this report any change in the companys internal control over financial reporting that occurred during the period covered by the annual report that has materially
affected, or is reasonably likely to materially affect, the companys internal control over financial reporting; and
| | -- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|5. | The companys other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the companys auditors
and the audit committee of the companys board of directors (or persons performing the equivalent functions):
|-- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | a) | all significant deficiencies in the design or operation of internal controls which could adversely affect the companys ability to record, process, summarize and report
financial information and have identified for the registrants auditors any material weaknesses in internal controls; and
| | -- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | b) | any fraud, whether or not material, that involves management or other employees who have a significant role in the companys internal control over financial reporting.
| | -- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------



Date: June 30, 2004



/s/ Valerio CavalloValerio CavalloChief Financial Officer