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| Area or operator | From abroad | Inside the country |
|---|---|---|
 Kaiserslautern · Germany | +49 631 … | 0631 … |
 Amagansett, NY · United States | +1 631 … | 1631 … |
| Amityville, NY · United States | +1 631 … | 1631 … |
| Bay Shore, NY · United States | +1 631 … | 1631 … |
| 37 more in United States | ||
 Weihai, Shandong · China | +86 631 … | 0631 … |
 Gaya, Bihar · India | +91 631 … | 0631 … |
 Faridpur · Bangladesh | +880 631 … | 0631 … |
 Sibolga/Pandan · Indonesia | +62 631 … | 0631 … |
 Hernandarias · Paraguay | +595 631 … | 0631 … |
 Viettel · Tanzania | +255 631 … | 0631 … |
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.