Exhibit 7.1

AMERICA MOVIL, S.A.B. DE C.V. AND SUBSIDIARIES

RATIO OF EARNINGS TO FIXED CHARGES

Thousands of Mexican pesos



|      |  |                                                                          |  |                |  |                |  |                |  |                |  |                
|----- |  | ------------------------------------------------------------------------ |  | -------------- |  | -------------- |  | -------------- |  | -------------- |  | ---------------
|      |  |                                                                          |  | 2005           |  | 2006           |  | 2007           |  | 2008           |  | 2009           
|      |  | Mexican FRS                                                              |  |                |  |                |  |                |  |                |  |                
|      |  |                                                                          |  |                |  |               
|      |  | Income before taxes on profits                                           |  | Ps. 33,432,068 |  | Ps. 61,527,609 |  | Ps. 81,151,600 |  | Ps. 79,463,731 |  | Ps. 99,257,161 
|      |  |                                                                          |  |                |  |               
|Plus: |  | Fixed charges :                                                          |  |                |  |                |  |                |  |                |  |                
|      |  | Interest expense                                                         |  | 9,151,266      |  | 9,618,645      |  | 9,865,355      |  | 11,610,982     |  | 10,689,719     
|      |  | Interest implicit in operating leases                                    |  | 189,596        |  | 263,090        |  | 338,440        |  | 352,989        |  | 444,785        
|      |  |                                                                          |  |                |  |               
|      |  |                                                                          |  |                |  |                |  |                |  |                |  |                
|      |  |                                                                          |  |                |  |               
|      |  | Earnings under Mexican FRS                                               |  | Ps. 42,772,929 |  | Ps. 71,409,344 |  | Ps. 91,355,395 |  | Ps. 91,427,702 |  | Ps. 110,391,665
|      |  |                                                                          |  |                |  |                |  |                |  |                |  |                
|      |  |                                                                          |  |                |  |               
|      |  | Mexican FRS:                                                             |  |                |  |                |  |                |  |                |  |                
|      |  |                                                                          |  |                |  |               
|      |  | U.S. GAAP:                                                               |  |                |  |                |  |                |  |                |  |                
|      |  | Total US GAAP adjustments, net                                           |  | -24,660        |  | -3,783,249     |  | -3,168,439     |  | -5,323,316     |  | -2,638,028     
|Less: |  | Deferred income tax                                                      |  | -32,350        |  | 1,948,894      |  | 57,859         |  | -2,272,321     |  | 744,192        
|Less: |  | Interest capitalized during the period                                   |  | -1,448,771     |  | -974,757       |  | 21,851         |  | 5,764,559      |  | -117,870       
|Plus: |  | Depreciation of capitalized interest                                     |  | 269,541        |  | 346,648        |  | 424,143        |  | -346,528       |  | -176,321       
|      |  |                                                                          |  |                |  |                |  |                |  |                |  |                
|      |  | US GAAP adjustments without deferred income tax and capitalized interest |  | -1,236,240     |  | -2,462,464     |  | -2,664,586     |  | -2,177,605     |  | -2,188,027     
|      |  |                                                                          |  |                |  |                |  |                |  |                |  |                
|      |  |                                                                          |  |                |  |               
|      |  | Earnings under U.S. GAAP                                                 |  | Ps. 41,582,424 |  | Ps. 68,909,102 |  | Ps. 88,633,188 |  | Ps. 89,140,681 |  | Ps. 108,007,924
|      |  |                                                                          |  |                |  |                |  |                |  |                |  |                
|      |  |                                                                          |  |                |  |               
|      |  | Fixed charges:                                                           |  |                |  |                |  |                |  |                |  |                
|      |  | Interest expense under US GAAP                                           |  | 7,892,091      |  | 8,906,978      |  | 10,225,646     |  | 17,728,531     |  | 11,016,634     
|Plus: |  | Interest capitalized during the period                                   |  | 1,448,771      |  | 974,757        |  | -21,851        |  | -5,764,559     |  | 117,870        
|      |  |                                                                          |  |                |  |                |  |                |  |                |  |                
|      |  |                                                                          |  |                |  |               
|      |  | Fixed charges under U.S. GAAP                                            |  | Ps. 9,340,862  |  | Ps. 9,881,735  |  | Ps. 10,203,795 |  | Ps. 11,963,971 |  | Ps. 11,134,504 
|      |  |                                                                          |  |                |  |                |  |                |  |                |  |                
|      |  |                                                                          |  |                |  |               
|      |  | Mexican FRS                                                              |  | 4.6            |  | 7.2            |  | 9.0            |  | 7.6            |  | 9.9            
|      |  |                                                                          |  |                |  |               
|      |  | U.S. GAAP                                                                |  | 4.5            |  | 7.0            |  | 8.7            |  | 7.5            |  | 9.7