030 is not a country code. Numbers inside a country start like this: Berlin (Germany), Bor (Serbia), Utrecht (Netherlands), Kandahar (Afghanistan) and others. The first digit 0 is the trunk prefix for domestic calls and is dropped from abroad.
Have the full number? Check it in the number lookup.
| Area or operator | From abroad | Inside the country |
|---|---|---|
 Berlin · Germany | +49 30 … | 030 … |
 Bor · Serbia | +381 30 … | 030 … |
 Utrecht · Netherlands | +31 30 … | 030 … |
 Kandahar · Afghanistan | +93 30 … | 030 … |
 Central Bosnia Canton · Bosnia & Herzegovina | +387 30 … | 030 … |
 Arda · Bulgaria | +359 30 … | 030 … |
| Banite · Bulgaria | +359 30 … | 030 … |
| Barutin · Bulgaria | +359 30 … | 030 … |
| 63 more in Bulgaria | ||
 Accra · Ghana | +233 30 … | 030 … |
| Ada · Ghana | +233 30 … | 030 … |
| Greater Accra Region · Ghana | +233 30 … | 030 … |
| 1 more in Ghana | ||
 ETL · Laos | +856 30 … | 030 … |
| Lao Telecom · Laos | +856 30 … | 030 … |
| Unitel · Laos | +856 30 … | 030 … |
 Bar/Ulcinj · Montenegro | +382 30 … | 030 … |
 Africell · Sierra Leone | +232 30 … | 030 … |
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.