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| Area or operator | From abroad | Inside the country |
|---|---|---|
 Avalon, CA · United States | +1 310 … | 1310 … |
| Beverly Hills, CA · United States | +1 310 … | 1310 … |
| California · United States | +1 310 … | 1310 … |
| 17 more in United States | ||
 Handan, Hebei · China | +86 310 … | 0310 … |
 Varėna · Lithuania | +370 310 … | 0310 … |
 Claro · Colombia | +57 310 … | 0310 … |
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.