0978 is not a country code. Numbers inside a country start like this: Bungotakada, Oita (Japan), Claro (Peru), Globe (Philippines), Pajala (Sweden) 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 |
|---|---|---|
 Bungotakada, Oita · Japan | +81 978 … | 0978 … |
| Kitsuki, Oita · Japan | +81 978 … | 0978 … |
| Kunisaki, Oita · Japan | +81 978 … | 0978 … |
 Claro · Peru | +51 978 … | 0978 … |
| Entel · Peru | +51 978 … | 0978 … |
| Movistar · Peru | +51 978 … | 0978 … |
 Globe · Philippines | +63 978 … | 0978 … |
 Pajala · Sweden | +46 978 … | 0978 … |
 Chunghwa Telecom · Taiwan | +886 978 … | 0978 … |
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.