| Pais | Country | Prefijo |
| Cambodia | Cambodia | 855 |
| Camerun | Cameroon | 237 |
| Canada | Canada | 1 |
| Chad | Chad | 235 |
| Chile | Chile | 56 |
| China | China | 86 |
| Chipre | Cyprus south | 357 |
| Colombia | Colombia | 57 |
| Comoros | Comoros | 269 |
| Congo | Congo | 387 |
| Corea de Sur | Korea south | 82 |
| Corea del Norte | Korea North | 850 |
| Costa de Marfil | Ivory Coast | 225 |
| Costa Rica | Costa Rica | 506 |
| Croacia | Croatia | 385 |
| Cuba | Cuba | 53 |