0381 is not a country code. Numbers inside a country start like this: Rostock (Germany), Agartala, Tripura (India), Anykščiai (Lithuania), Patos, Fier (Albania) 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 |
|---|---|---|
 Rostock · Germany | +49 381 … | 0381 … |
 Agartala, Tripura · India | +91 381 … | 0381 … |
 Anykščiai · Lithuania | +370 381 … | 0381 … |
 Patos, Fier · Albania | +355 381 … | 0381 … |
 San Miguel de Tucumán, Tucumán · Argentina | +54 381 … | 0381 … |
 Laximpur/Ramganj · Bangladesh | +880 381 … | 0381 … |
 Ende · Indonesia | +62 381 … | 0381 … |
 Eksjö · Sweden | +46 381 … | 0381 … |
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.