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| Area or operator | From abroad | Inside the country |
|---|---|---|
 Baikonur · Russia | +7 331 … | 8331 … |
 Potsdam · Germany | +49 331 … | 0331 … |
 Illinois · United States | +1 331 … | 1331 … |
 Feni/Sonagazi/Chagalnaiya/Daganbhuyan · Bangladesh | +880 331 … | 0331 … |
 Jember · Indonesia | +62 331 … | 0331 … |
 Ufone · Pakistan | +92 331 … | 0331 … |
 Botoșani · Romania | +40 331 … | 0331 … |
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.