0256 is not a country code. Numbers inside a country start like this: Agarak, Lori (Armenia), Riscani (Moldova), Aydin (Türkiye), Sanjo, Niigata (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 |
|---|---|---|
 Agarak, Lori · Armenia | +374 256 … | 0256 … |
| Bovadzor/Stepanavan, Lori · Armenia | +374 256 … | 0256 … |
| Kurtan, Lori · Armenia | +374 256 … | 0256 … |
| 2 more in Armenia | ||
 Riscani · Moldova | +373 256 … | 0256 … |
 Aydin · Türkiye | +90 256 … | 0256 … |
 Sanjo, Niigata · Japan | +81 256 … | 0256 … |
 Timiș · Romania | +40 256 … | 0256 … |
 Portuguesa · Venezuela | +58 256 … | 0256 … |
 Binh Dinh Province · Vietnam | +84 256 … | 0256 … |
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.