0277 is not a country code. Numbers inside a country start like this: Shtiqen/Tërthore/Zapod, Kukës (Albania), Kiryu, Gunma (Japan), Táchira/Mérida (Venezuela), Dong Thap Province (Vietnam) 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 |
|---|---|---|
 Shtiqen/Tërthore/Zapod, Kukës · Albania | +355 277 … | 0277 … |
 Kiryu, Gunma · Japan | +81 277 … | 0277 … |
 Táchira/Mérida · Venezuela | +58 277 … | 0277 … |
 Dong Thap Province · Vietnam | +84 277 … | 0277 … |
 Mvurwi · Zimbabwe | +263 277 … | 0277 … |
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.