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| Area or operator | From abroad | Inside the country |
|---|---|---|
 Fulda · Germany | +49 661 … | 0661 … |
 Acton, CA · United States | +1 661 … | 1661 … |
| Arvin, CA · United States | +1 661 … | 1661 … |
| Bakersfield, CA · United States | +1 661 … | 1661 … |
| 19 more in United States | ||
 Rourkela, Odisha · India | +91 661 … | 0661 … |
 BITĖ · Lithuania | +370 661 … | 0661 … |
| Lancelot Telecom · Lithuania | +370 661 … | 0661 … |
| Tele 2 · Lithuania | +370 661 … | 0661 … |
 T-Mobile AT · Austria | +43 661 … | 0661 … |
 Madaripur · Bangladesh | +880 661 … | 0661 … |
 Dimoco · Liechtenstein | +423 661 … | 0661 … |
| FL1 · Liechtenstein | +423 661 … | 0661 … |
 Bredbyn · Sweden | +46 661 … | 0661 … |
 Airtel · Tanzania | +255 661 … | 0661 … |
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.