| País | Prefijo | Desde España |
|---|---|---|
| Bahamas | +1 242 | 001 242 |
| Bahréin | +973 | 00973 |
| Bangladesh | +880 | 00880 |
| Barbados | +1 246 | 001 246 |
| Bélgica | +32 | 0032 |
| Belice | +501 | 00501 |
| Benín | +229 | 00229 |
| Bermudas | +1 441 | 001 441 |
| Bielorrusia | +375 | 00375 |
| Birmania | +95 | 0095 |
| Bolivia | +591 | 00591 |
| Bonaire | +599 7 | 00599 7 |
| Bosnia y Herzegovina | +387 | 00387 |
| Botsuana | +267 | 00267 |
| Brasil | +55 | 0055 |
| Brunéi | +673 | 00673 |
| Bulgaria | +359 | 00359 |
| Burkina Faso | +226 | 00226 |
| Burundi | +257 | 00257 |
| Bután | +975 | 00975 |
