0266 is not a country code. Numbers inside a country start like this: Archis, Tavush (Armenia), Balikesir (Türkiye), Bushat/Bërdicë, Shkodër (Albania), San Luis, San Luis (Argentina) 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 |
|---|---|---|
 Archis, Tavush · Armenia | +374 266 … | 0266 … |
| Baghanis, Tavush · Armenia | +374 266 … | 0266 … |
| Berdavan/Koghb/Noyemberyan, Tavush · Armenia | +374 266 … | 0266 … |
| 8 more in Armenia | ||
 Balikesir · Türkiye | +90 266 … | 0266 … |
 Bushat/Bërdicë, Shkodër · Albania | +355 266 … | 0266 … |
 San Luis, San Luis · Argentina | +54 266 … | 0266 … |
 Sukabumi · Indonesia | +62 266 … | 0266 … |
 Suwa, Nagano · Japan | +81 266 … | 0266 … |
 Harghita · Romania | +40 266 … | 0266 … |
 Zulia · Venezuela | +58 266 … | 0266 … |
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.