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| Area or operator | From abroad | Inside the country |
|---|---|---|
 Silknet · Georgia | +995 510 … | 0510 … |
 Katel · Kyrgyzstan | +996 510 … | 0510 … |
 Alfa iletisim · Türkiye | +90 510 … | 0510 … |
| Assistant Telecom · Türkiye | +90 510 … | 0510 … |
| Duru Telekom · Türkiye | +90 510 … | 0510 … |
| 11 more in Türkiye | ||
 Alameda, CA · United States | +1 510 … | 1510 … |
| Berkeley, CA · United States | +1 510 … | 1510 … |
| California · United States | +1 510 … | 1510 … |
| 11 more in United States | ||
 Wuxi, Jiangsu · China | +86 510 … | 0510 … |
 Lidköping · Sweden | +46 510 … | 0510 … |
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.