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| Area or operator | From abroad | Inside the country |
|---|---|---|
 Alexandria · Egypt | +20 3 … | 03 … |
| Area or operator | From abroad | Inside the country |
|---|---|---|
 Duisburg · Germany | +49 203 … | 0203 … |
 Ansonia, CT · United States | +1 203 … | 1203 … |
| Bethany, CT · United States | +1 203 … | 1203 … |
| Bethlehem, CT · United States | +1 203 … | 1203 … |
| 40 more in United States | ||
 Quang Ninh Province · Vietnam | +84 203 … | 0203 … |
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.