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| Area or operator | From abroad | Inside the country |
|---|---|---|
 Nuuday · Denmark | +45 23 … | 23 … |
| tdc · Denmark | +45 23 … | 23 … |
| telenor · Denmark | +45 23 … | 23 … |
| 1 more in Denmark | ||
| Area or operator | From abroad | Inside the country |
|---|---|---|
 Malente · Germany | +49 4523 … | 04523 … |
 Kaligonj · Bangladesh | +880 4523 … | 04523 … |
 Colonia del Scaramento · Uruguay | +598 4523 … | 04523 … |
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.