| Country | Country Code | Required Units | Supported Network |
| Cambodia | +855 | 9.46 | ALL |
| Cameroon | +237 | 4.40 | ALL |
| Canada | +1 | 22.00 | ALL |
| Cape Verde | +238 | 5.72 | ALL |
| Central African R. | +236 | 3.19 | ALL |
| Chad | +235 | 3.19 | ALL |
| Chile | +56 | 22.00 | ALL |
| China | +86 | 6.92 | ALL |
| Colombia | +57 | 22.00 | ALL |
| Comoros | +269 | 6.38 | ALL |
| Congo (Democratic) | +243 | 22.00 | ALL |
| Congo (Republic) | +242 | 12.32 | ALL |
| Cook Islands | +682 | 5.28 | ALL |
| Costa Rica | +506 | 22.00 | ALL |
| Cote d'Ivoire | +225 | 3.19 | ALL |
| Croatia | +385 | 7.59 | ALL |
| Cuba | +53 | 1.98 | ALL |
| Cyprus | +357 | 5.06 | ALL |
| Czech Republic | +420 | 22.00 | ALL |
