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| Area or operator | From abroad | Inside the country |
|---|---|---|
 Albany, KY · United States | +1 606 … | 1606 … |
| Annville, KY · United States | +1 606 … | 1606 … |
| Ashland, KY · United States | +1 606 … | 1606 … |
| 58 more in United States | ||
 Eje Cafetero · Colombia | +57 606 … | 0606 … |
| Manizales · Colombia | +57 606 … | 0606 … |
| Pereira · Colombia | +57 606 … | 0606 … |
 Layyah · Pakistan | +92 606 … | 0606 … |
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.