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| Area or operator | From abroad | Inside the country |
|---|---|---|
 Komi Republic · Russia | +7 821 … | 8821 … |
 Augsburg · Germany | +49 821 … | 0821 … |
 South Carolina · United States | +1 821 … | 1821 … |
 Mysore, Karnataka · India | +91 821 … | 0821 … |
 Sylhet · Bangladesh | +880 821 … | 0821 … |
| Sylhet MEA · Bangladesh | +880 821 … | 0821 … |
 Vodacom · Congo - Kinshasa | +243 821 … | 0821 … |
 Telkomsel · Indonesia | +62 821 … | 0821 … |
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.