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| Area or operator | From abroad | Inside the country |
|---|---|---|
 Beeline · Russia | +7 904 … | 8904 … |
| MegaFon · Russia | +7 904 … | 8904 … |
| Motiv · Russia | +7 904 … | 8904 … |
| 3 more in Russia | ||
 Callahan, FL · United States | +1 904 … | 1904 … |
| Fernandina Beach, FL · United States | +1 904 … | 1904 … |
| Florida · United States | +1 904 … | 1904 … |
| 11 more in United States | ||
 NCell · Nepal | +977 904 … | 0904 … |
 Airtel · Nigeria | +234 904 … | 0904 … |
 T-Mobile (Slovak Telekom) · Slovakia | +421 904 … | 0904 … |
 Syriatel · Syria | +963 904 … | 0904 … |
 Taiwan Mobile · Taiwan | +886 904 … | 0904 … |
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.