0263 is not a country code. Numbers inside a country start like this: Achajur, Tavush (Armenia), Leova (Moldova), Pult/Shalë/Shosh/Temal/Shllak, Shkodër (Albania), San Martín, Mendoza (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 |
|---|---|---|
 Achajur, Tavush · Armenia | +374 263 … | 0263 … |
| Aygehovit, Tavush · Armenia | +374 263 … | 0263 … |
| Azatamut, Tavush · Armenia | +374 263 … | 0263 … |
| 3 more in Armenia | ||
 Leova · Moldova | +373 263 … | 0263 … |
 Pult/Shalë/Shosh/Temal/Shllak, Shkodër · Albania | +355 263 … | 0263 … |
 San Martín, Mendoza · Argentina | +54 263 … | 0263 … |
 Cianjur · Indonesia | +62 263 … | 0263 … |
 Matsumoto, Nagano · Japan | +81 263 … | 0263 … |
 Bistrița-Năsăud · Romania | +40 263 … | 0263 … |
 Zulia · Venezuela | +58 263 … | 0263 … |
 Lam Dong Province · Vietnam | +84 263 … | 0263 … |
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.