0531 is not a country code. Numbers inside a country start like this: Turkcell (Türkiye), Braunschweig (Germany), Jinan, Shandong (China), Dianjpur/Parbitipur/Hakimpur (Hili) (Bangladesh) and others. The first digit 0 is the trunk prefix for domestic calls and is dropped from abroad.
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| Area or operator | From abroad | Inside the country |
|---|---|---|
 Turkcell · Türkiye | +90 531 … | 0531 … |
 Braunschweig · Germany | +49 531 … | 0531 … |
 Jinan, Shandong · China | +86 531 … | 0531 … |
 Dianjpur/Parbitipur/Hakimpur (Hili) · Bangladesh | +880 531 … | 0531 … |
 Sampit · Indonesia | +62 531 … | 0531 … |
 Tahara, Aichi · Japan | +81 531 … | 0531 … |
 Bengtsfors · Sweden | +46 531 … | 0531 … |
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.