0599 is not a country code. Numbers inside a country start like this: MagtiCom (Georgia), Nanping, Fujian (China), Stadskanaal (Netherlands), Ago, Mie (Japan) 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 |
|---|---|---|
 MagtiCom · Georgia | +995 599 … | 0599 … |
 Nanping, Fujian · China | +86 599 … | 0599 … |
 Stadskanaal · Netherlands | +31 599 … | 0599 … |
 Ago, Mie · Japan | +81 599 … | 0599 … |
| Toba, Mie · Japan | +81 599 … | 0599 … |
 Palestine Cellular Communications · Palestinian Territories | +970 599 … | 0599 … |
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.