Table of Contents

Exhibit 12.1

CERTIFICATION OF PERIODIC REPORT UNDER SECTION 302 OF
THE SARBANES-OXLEY ACT OF 2002 
COMPAÑÍA DE TELECOMUNICACIONES DE CHILE S.A.

I, José Molés Valenzuela, the Chief Executive Officer, certify that:

|1. | I have reviewed this annual report on Form 20-F of Compañía de Telecomunicaciones de Chile S.A.;                                                                                                                                                                                                                                    
|-- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|  
|2. | Based on my knowledge, this 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 company as of, and for, the
    periods presented in this report;                                            
|  
|4. | The companys other certifying officers 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)                                                                                                                                                                                                                                                                                                                                 
|  
|   | (b)                                                                                                                                                                                                                                                                                                                                 
|  
|   | (c)                                                                                                                                                                                                                                                                                                                                 
|  
|   | (d)                                                                                                                                                                                                                                                                                                                                 
|  
|5. | The companys other certifying officers 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)                                                                                                  
|
| | (b)                                                                                                  
|

Date: April 13, 2007

|                         
|-------------------------
|/s/ José Molés Valenzuela
|José Molés Valenzuela    
|                         
|Chief Executive Officer  

---