0966 is not a country code. Numbers inside a country start like this: Sarmi (Indonesia), Hitoyoshi, Kumamoto (Japan), D.I. Khan (Pakistan), Claro (Peru) 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 |
|---|---|---|
 Sarmi · Indonesia | +62 966 … | 0966 … |
 Hitoyoshi, Kumamoto · Japan | +81 966 … | 0966 … |
| Minamata, Kumamoto · Japan | +81 966 … | 0966 … |
 D.I. Khan · Pakistan | +92 966 … | 0966 … |
 Claro · Peru | +51 966 … | 0966 … |
| Movistar · Peru | +51 966 … | 0966 … |
 Globe · Philippines | +63 966 … | 0966 … |
 Chunghwa Telecom · Taiwan | +886 966 … | 0966 … |
| FarEasTone · Taiwan | +886 966 … | 0966 … |
| Taiwan Mobile · Taiwan | +886 966 … | 0966 … |
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.