Exhibit 7.1

América Móvil, S.A.B. de C.V. and Subsidiaries

Computation
of Ratio of Earnings to Fixed Charges

Amounts in Thousands of Mexican pesos, Except Ratios



|                                            |  |      |             |   |      |     |             |      |  |     |             |  
|------------------------------------------- |  | ---- | ----------- | - | ---- | --- | ----------- | ---- |  | --- | ----------- | -
|                                            |  | 2009 |             |   | 2010 |     |             | 2011 | 
|IFRS                                        |  |      |             |   |      |     |             |      |  |     |             |  
|Earnings:                                   |  |      |             |   |      |     |             |      |  |     |             |  
|Profit before income tax                    |  | Ps.  | 143,200,212 |   |      | Ps. | 135,119,042 |      |  | Ps. | 128,544,828 |  
|Plus:                                       |  |      |             |   |      |     |             |      |  |     |             |  
|Interest expense                            |  |      | 16,564,152  |   |      |     | 19,934,283  |      |  |     | 22,716,083  |  
|Interest implicit in operating leases       |  |      | 588,565     |   |      |     | 411,202     |      |  |     | 547,039     |  
|Less:                                       |  |      |             |   |      |     |             |      |  |     |             |  
|Equity interest in net income of affiliates |  |      | (1,959,378  | ) |      |     | (1,671,210  | )    |  |     | (1,923,997  | )
|                                            |  |      |             |   |      |     |             |      |  |     |             |  
|                                            |  | Ps.  | 158,393,550 |   |      | Ps. | 153,793,317 |      |  | Ps. | 149,883,953 |  
|                                            |  |      |             |   |      |     |             |      |  |     |             |  
|                                            |  |      |            
|Fixed Charges:                              |  |      |             |   |      |     |             |      |  |     |             |  
|Interest expense                            |  |      | 16,564,512  |   |      |     | 19,934,283  |      |  |     | 22,716,083  |  
|Interest implicit in operating leases       |  |      | 588,565     |   |      |     | 411,202     |      |  |     | 547,039     |  
|                                            |  |      |             |   |      |     |             |      |  |     |             |  
|                                            |  | Ps.  | 17,153,077  |   |      | Ps. | 20,345,485  |      |  | Ps. | 23,263,122  |  
|                                            |  |      |             |   |      |     |             |      |  |     |             |  
|                                            |  |      |            
|Ratio of earnings to fixed charges          |  |      | 9.2         |   |      |     | 7.6         |      |  |     | 6.4         |  
|                                            |  |      |             |   |      |     |             |      |  |     |             |