Conference calls by cities
| Region | Telephone code | Telephone number |
| Blagoevgrad | 73 | 500281 |
| Bourgas | 56 | 900281 |
| Varna | 52 | 900281 |
| VelikoTarnovo | 62 | 500281 |
| Vidin | 94 | 900281 |
| Vratsa | 92 | 900281 |
| Gabrovo | 66 | 900281 |
| Dobritch | 58 | 500281 |
| Kardzhali | 361 | 50281 |
| Kyustendil | 78 | 900281 |
| Lovech | 68 | 500281 |
| Montana | 96 | 500281 |
| Pazardjik | 34 | 900281 |
| Pernik | 76 | 500281 |
| Pleven | 64 | 900281 |
| Plovdiv | 32 | 500281 |
| Razgrad | 84 | 500281 |
| Rousse | 82 | 500974; 500281 |
| Silistra | 86 | 500281 |
| Sliven | 44 | 500281 |
| Smolyan | 301 | 50281 |
| Sofia | 2 | 4002081 |
| Stara Zagora | 42 | 900281 |
| Targoviste | 601 | 50281 |
| Haskovo | 38 | 500281 |
| Shoumen | 54 | 900281 |
| Yambol | 46 | 900281 |