As filed with the Securities and Exchange Commission on September 5, 2013







UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549





FORM 20-F/A

Amendment No. 1







Annual Report Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

for the fiscal year ended
December 31, 2012

Commission file number: 1-16269





AMÉRICA MÓVIL, S.A.B. DE C.V.

(exact name of registrant as specified in its charter)





America Mobile

(translation of registrants name into English)

United Mexican States

(jurisdiction of incorporation)

Lago Zurich 245, Plaza Carso / Edificio
Telcel, Colonia Granada Ampliación, Delegación Miguel Hidalgo, 11529, México, D.F., México

(address of principal executive offices)

Daniela Lecuona Torras, Telephone: (5255) 2581-4449, E-mail: daniela.lecuona@americamovil.com

Facsimile: (5255) 2581-4422, Lago Zurich 245, Plaza Carso / Edificio Telcel, Piso 16, Colonia Granada Ampliación, Delegación Miguel Hidalgo, 11529, México, D.F., México

(name, telephone, e-mail and/or facsimile number and address of company contact person)

Securities registered pursuant to Section 12(b) of the Act:



|                                                                             |  |                                                    
|---------------------------------------------------------------------------- |  | ---------------------------------------------------
|Title of each class:                                                         |  | Name of each exchange on which registered:         
|American Depositary Shares, each representing 20 A Shares, without par value |  | NASDAQ National Market                             
|A Shares, without par value                                                  |  | NASDAQ National Market (for listing purposes only) 
|American Depositary Shares, each representing 20 L Shares, without par value |  | New York Stock Exchange                            
|L Shares, without par value                                                  |  | New York Stock Exchange (for listing purposes only)
|2.375% Senior Notes Due 2016                                                 |  | New York Stock Exchange                            
|3.125% Senior Notes Due 2022                                                 |  | New York Stock Exchange                            
|4.375% Senior Notes Due 2042                                                 |  | New York Stock Exchange                            

Securities registered pursuant to Section 12(g) of the Act:None

Securities for which there is a reporting obligation pursuant to Section 15(d) of the Act:None

The number of outstanding shares of each of the registrants classes of capital or common stock as of December 31, 2012:



|               |  |          
|-------------- |  | ---------
|23,424 million |  | AA Shares
|712 million    |  | A Shares 
|51,703 million |  | L Shares 

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities
Act.x  Yes     ̈  No

If this report is an annual or transition report, indicate by check mark if the registrant is not required to file reports pursuant to Section 13
or 15(d) of the Securities Exchange Act of 1934. ̈  Yes    x  No

Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the
Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports) and (2) has been subject to such filing requirements for the past 90
days.xYes ̈No

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File
required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this Chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such
files).x  Yes     ̈  No

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, or a non-accelerated filer. See definition of
accelerated filer and large accelerated filer in Rule 12b-2 of the Exchange Act. (Check one):



|                           |  |                      |  |                         
|-------------------------- |  | -------------------- |  | ------------------------
|Large accelerated
filer  x |  | Accelerated filer   ̈ |  | Non-accelerated filer   ̈

Indicate by check mark which basis of accounting the registrant has used to prepare the financial statements included
in this filing:

|             |  |                                                                                                          |  |         
|------------ |  | -------------------------------------------------------------------------------------------------------- |  | --------
|U.S. GAAP   ̈ |  | International Financial Reporting Standards as issued by the International Accounting Standards Board  x |  | Other   ̈

If other has been checked in response to the previous question, indicate by check mark which financial
statement item the registrant has elected to
follow.    Item 17 ̈Item 18 ̈

If this is an annual report, indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange
Act). ̈  Yes    x  No









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Explanatory Note

This Amendment No. 1 on Form 20-F/A (this Amendment No. 1) is being filed solely to correct a typographical error contained
in Item 15. Controls and Procedures of the Annual Report on Form 20-F for the fiscal year ended December 31, 2012 of América Móvil, S.A.B. de C.V. (the Registrant), which was originally filed on April 30,
2013 (the Form 20-F).

This Amendment No. 1 consists of a cover page, this explanatory note, the corrected Item
15, Item 19, the signature pages and required certifications of the chief executive officer and chief financial officer of the Registrant, as well as the consent of the Registrants independent auditors to the incorporation by reference of
their report on the effectiveness of the Registrants internal control over financial reporting included in this Amendment No.1.

This Amendment No. 1 makes no changes to the financial statements of the Registrant included in the Form 20-F. Except as described above, this Amendment No.1 does not amend, update or restate the
information in any other item of the Form 20-F or reflect any events that have occurred after the filing of the Form 20-F.



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|Item 15. | Controls and Procedures
|-------- | -----------------------

(a) Disclosure controls and procedures.We carried out an evaluation under the supervision and with the
participation of our management, including our Chief Executive Officer and Chief Financial Officer, of the effectiveness of the design and operation of our disclosure controls and procedures as of December 31, 2012. There are inherent
limitations to the effectiveness of any system of disclosure controls and procedures, including the possibility of human error and the circumvention or overriding of the controls and procedures. Accordingly, even effective disclosure controls and
procedures can only provide reasonable assurance of achieving their control objectives. Based upon our evaluation, our Chief Executive Officer and Chief Financial Officer concluded that our disclosure controls and procedures were effective to
provide reasonable assurance that information required to be disclosed by us in the reports that we file or submit under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the applicable rules and
forms, and that it is accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial Officer, as appropriate to allow timely decisions regarding required disclosure.

(b) Managements annual report on internal control over financial reporting.Our management is
responsible for establishing and maintaining adequate internal control over financial reporting, as such term is defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act. Under the supervision and with the participation of our management,
including our Board of Directors, Chief Executive Officer, Chief Financial Officer and other personnel, we conducted an evaluation of the effectiveness of our internal control over financial reporting based on the framework in Internal
ControlIntegrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission.

Our
internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with IFRS. Our internal
control over financial reporting includes those policies and procedures that (i) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of our assets; (ii) provide
reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with IFRS, and that our receipts and expenditures are being made only in accordance with authorizations of our management
and directors; and (iii) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of our assets that could have a material effect on our financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections
of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

Based on our evaluation under the framework in Internal ControlIntegrated Framework, our management concluded that our internal
control over financial reporting was effective as of December 31, 2012.

Mancera, S.C., a member practice of
Ernst & Young Global, an independent registered public accounting firm, our independent auditor, issued an attestation report on our internal control over financial reporting on April 22, 2013.

(c) Attestation Report of the registered public accounting firm.



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Report of Independent Registered Public Accounting Firm on Internal Control Over Financial Reporting.

The Board of Directors and Shareholders of

América Móvil, S.A.B. de C.V.

We have audited América
Móvil, S.A.B. de C.V. and subsidiaries internal control over financial reporting as of December 31, 2012, based on criteria established in Internal ControlIntegrated Framework issued by the Committee of Sponsoring
Organizations of the Treadway Commission (the COSO criteria). América Móvil, S.A.B. de C.V. and subsidiaries management is responsible for maintaining effective internal control over financial reporting, and for its assessment of
the effectiveness of internal control over financial reporting included in the accompanying Managements Annual Report on Internal Control over Financial Reporting. Our responsibility is to express an opinion on the Companys internal
control over financial reporting based on our audit.

We conducted our audit in accordance with the standards of the Public
Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects.
Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed
risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

A companys internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial
statements for external purposes in accordance with International Financial Reporting Standards, as issued by the International Accounting Standards Board (IFRS). A companys internal control over financial reporting includes those
policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that
transactions are recorded as necessary to permit preparation of financial statements in accordance with IFRS, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the
company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the companys assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections
of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

In our opinion, América Móvil, S.A.B. de C.V. and subsidiaries maintained, in all material respects, effective internal
control over financial reporting as of December 31, 2012, based on the COSO criteria.

We have also audited, in
accordance with the standards of the Public Company Accounting Oversight Board (United States), the consolidated statements of financial position of América Móvil, S.A.B. de C.V. and subsidiaries as of December 31, 2011 and 2012
and the related consolidated statements of comprehensive income, changes in equity and cash flows for each of the three years in the period ended December 31, 2012, and our report dated April 22, 2013, expressed an unqualified opinion
thereon.



Mancera, S.C. A member
practice of Ernst & Young Global/s/ Omero Campos SeguraOmero Campos Segura


Mexico City

April 22, 2013



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(d) Changes in internal control over financial
reporting.There has been no change in our internal control over financial reporting during 2012 that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.



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|Item 19. | Exhibits
|-------- | --------

Documents filed
as exhibits to this amendment:



|     |  |                                                                                                    
|---- |  | ---------------------------------------------------------------------------------------------------
|12.1 |  | Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
|     | 
|12.2 |  | Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
|     | 
|13.1 |  | Certification pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.                           
|     | 
|15.1 |  | Consent of Mancera, S.C.                                                                           



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SIGNATURES

The registrant hereby certifies that it meets all of the requirements for filing on Form 20-F/A and that it has duly caused and authorized the undersigned to sign this annual report on its behalf.

Dated: September 5, 2013



AMÉRICA MÓVIL, S.A.B. DE C.V.By:

/s/ Carlos José García Moreno ElizondoName:

Carlos José García Moreno ElizondoTitle:

Chief Financial Officer




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