057 is not a country code. Numbers inside a country start like this: Kharkiv (Ukraine), Ucom (Armenia), Faryab (Afghanistan), Ypres (Belgium) and others. The first digit 0 is the trunk prefix for domestic calls and is dropped from abroad.
Have the full number? Check it in the number lookup.
| Area or operator | From abroad | Inside the country |
|---|---|---|
 Kharkiv · Ukraine | +380 57 … | 057 … |
 Ucom · Armenia | +374 57 … | 057 … |
 Faryab · Afghanistan | +93 57 … | 057 … |
 Ypres · Belgium | +32 57 … | 057 … |
 East Sarajevo · Bosnia & Herzegovina | +387 57 … | 057 … |
 Albena · Bulgaria | +359 57 … | 057 … |
| Batovo · Bulgaria | +359 57 … | 057 … |
| Belgun · Bulgaria | +359 57 … | 057 … |
| 65 more in Bulgaria | ||
 Damietta · Egypt | +20 57 … | 057 … |
 Arjo, West Region · Ethiopia | +251 57 … | 057 … |
| Assosa, West Region · Ethiopia | +251 57 … | 057 … |
| Backo, West Region · Ethiopia | +251 57 … | 057 … |
| 3 more in Ethiopia | ||
If a number starts with +, the first 1–3 digits are the country code. If it starts with 0 (8 in Russia and Kazakhstan), it is a domestic number: an area or operator code follows, and from abroad the 0 or 8 is replaced with + and the country code. The same digits can mean different places, so where the call came from matters.