**Exhibit12.1**

** **

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

 

I, Hector Castro Noboa, certify that:

 

1.             Ihave reviewed this annual report on Form 20-F of Tricom, S.A. (the “Company”);

 

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

 

3.             Basedon my knowledge, the financial statements, and other financial informationincluded in this annual report, fairly present in all material respects thefinancial condition, results of operations and cash flows of the Company as of,and for, the periods presented in this annual report;

 

4.             TheCompany’s other certifying officers and I am responsible for establishing andmaintaining disclosure controls and procedures (as defined in Exchange ActRules 13a-15(e) and 15d-(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 and presentedin this annual report our conclusion about the effectiveness of the disclosurescontrols and procedures, as of the end of the period covered by this annualreport 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.             TheCompany’s other certifying officers and I have disclosed, based on our mostrecent evaluation of internal control over financial reporting, to the Company’sauditors and the audit committee of the Company’s Board of Directors (orpersons performing the equivalent 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 |   |
|--------|--------------------------------------|--------|
|   | Hector Castro Noboa                  |
|   | Chief Executive Officer              |

 

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