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| Area or operator | From abroad | Inside the country |
|---|---|---|
 Nizhni Novgorod · Russia | +7 831 … | 8831 … |
 Kempten Allgäu · Germany | +49 831 … | 0831 … |
 Aptos, CA · United States | +1 831 … | 1831 … |
| Aromas, CA · United States | +1 831 … | 1831 … |
| Ben Lomond, CA · United States | +1 831 … | 1831 … |
| 19 more in United States | ||
 Yibin, Sichuan · China | +86 831 … | 0831 … |
 Belgaum, Karnataka · India | +91 831 … | 0831 … |
 Habiganj · Bangladesh | +880 831 … | 0831 … |
 Vodacom · Congo - Kinshasa | +243 831 … | 0831 … |
 AXIS · Indonesia | +62 831 … | 0831 … |
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.