0541 is not a country code. Numbers inside a country start like this: Vodafone (Türkiye), Osnabrück (Germany), Oldenzaal (Netherlands), Gaibandha/Gabindaganj (Bangladesh) 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 |
|---|---|---|
 Vodafone · Türkiye | +90 541 … | 0541 … |
 Osnabrück · Germany | +49 541 … | 0541 … |
 Oldenzaal · Netherlands | +31 541 … | 0541 … |
 Gaibandha/Gabindaganj · Bangladesh | +880 541 … | 0541 … |
 Samarinda/Tenggarong · Indonesia | +62 541 … | 0541 … |
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.