0355 is not a country code. Numbers inside a country start like this: Signagi (Georgia), Cottbus (Germany), Changzhi, Shanxi (China), Tulungagung/Trenggalek (Indonesia) 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 |
|---|---|---|
 Signagi · Georgia | +995 355 … | 0355 … |
 Cottbus · Germany | +49 355 … | 0355 … |
 Changzhi, Shanxi · China | +86 355 … | 0355 … |
 Tulungagung/Trenggalek · Indonesia | +62 355 … | 0355 … |
 Caraș-Severin · Romania | +40 355 … | 0355 … |
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.