0259 is not a country code. Numbers inside a country start like this: Falesti (Moldova), Sado, Niigata (Japan), Bihor (Romania), Falcón (Venezuela) 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 |
|---|---|---|
 Falesti · Moldova | +373 259 … | 0259 … |
 Sado, Niigata · Japan | +81 259 … | 0259 … |
 Bihor · Romania | +40 259 … | 0259 … |
 Falcón · Venezuela | +58 259 … | 0259 … |
 Ninh Thuan Province · Vietnam | +84 259 … | 0259 … |
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.