**Exhibit 12.1**

**Certificationof Chief Executive Officer Pursuant To Section 302 of the Sarbanes-Oxley Act Of2002**

I, Héctor Castro Noboa,certify that:

1.             I have reviewed thisannual report on Form 20-F of Tricom, S.A. (the “Company”);

2.             Based on my knowledge,this annual report does not contain any untrue statement of a material fact oromit to state a material fact necessary to make the statements made, in lightof the circumstances under which such statements were made, not misleading withrespect to the period covered by this annual report;

3.             Based on my knowledge,the financial statements, and other financial information included in thisannual report, fairly present in all material respects the financial condition,results of operations and cash flows of the Company as of, and for, the periodspresented in this annual report;

4.             The Company’s othercertifying officers and I am responsible for establishing and maintainingdisclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and15d-(e)) for the Company and we have:

a)                                      designedsuch disclosure controls and procedures, or caused such disclosure controls andprocedures to be designed under our supervision,  to ensure that material information relatingto the Company, including its consolidated subsidiaries, is made known to us byothers within those entities, particularly during the period in which thisannual report is being prepared;

b)                                   evaluatedthe effectiveness of the Company’s disclosure controls and procedures andpresented in this annual report our conclusion about the effectiveness of thedisclosures controls and procedures, as of the end of the period covered bythis annual report based on such evaluation; and

c)                                    disclosedin this report any change in the Company’s internal control over financialreporting that occurred during the period covered by the annual report that hasmaterially affected, or is reasonably likely to materially affect, the Company’sinternal control over financial reporting; and

5.             The Company’s othercertifying officers and I have disclosed, based on our most recent evaluationof internal control over financial reporting, to the Company’s auditors and theaudit committee of the Company’s Board of Directors (or persons performing theequivalent function):

a)                                    allsignificant deficiencies and material weaknesses in the design or operation ofinternal control over financial reporting which are reasonably likely toadversely affect the Company’s ability to record, process, summarize and reportfinancial information; and

b)                                   anyfraud, whether or not material, that involves management or other employees whohave a significant role in the Company’s internal control over financialreporting.
| Dated: October 29, 2007 |   |                      |
|-------------------------|--------|---------------------------|
|                    |   |                      |
|                    |   | /s/ HECTOR  CASTRO NOBOA  |   |
|                    |   | Héctor Castro  Noboa |
|                    |   | Chief Executive  Officer  |

 

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