0912 is not a country code. Numbers inside a country start like this: Yulin, Shaanxi (China), IR-MCI (Iran), Airtel (Nigeria), Entel (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 |
|---|---|---|
 Yulin, Shaanxi · China | +86 912 … | 0912 … |
 IR-MCI · Iran | +98 912 … | 0912 … |
 Airtel · Nigeria | +234 912 … | 0912 … |
 Entel · Peru | +51 912 … | 0912 … |
 Smart · Philippines | +63 912 … | 0912 … |
 T-Mobile (Slovak Telekom) · Slovakia | +421 912 … | 0912 … |
 Galle · Sri Lanka | +94 912 … | 0912 … |
 Byske · Sweden | +46 912 … | 0912 … |
 Chunghwa Telecom · Taiwan | +886 912 … | 0912 … |
 Vinaphone · Vietnam | +84 912 … | 0912 … |
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.