0577 is not a country code. Numbers inside a country start like this: Silknet (Georgia), Wenzhou, Zhejiang (China), Elspeet (Netherlands), Rrogozhinë, Kavajë (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 |
|---|---|---|
 Silknet · Georgia | +995 577 … | 0577 … |
 Wenzhou, Zhejiang · China | +86 577 … | 0577 … |
 Elspeet · Netherlands | +31 577 … | 0577 … |
 Rrogozhinë, Kavajë · Albania | +355 577 … | 0577 … |
 Takayama, Gifu · Japan | +81 577 … | 0577 … |
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.