0712 is not a country code. Numbers inside a country start like this: Xiaogan, Hubei (China), Nagpur, Maharashtra (India), Kayu Agung/Tanjung Raja (Indonesia), Safaricom (Kenya) 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 |
|---|---|---|
 Xiaogan, Hubei · China | +86 712 … | 0712 … |
 Nagpur, Maharashtra · India | +91 712 … | 0712 … |
 Kayu Agung/Tanjung Raja · Indonesia | +62 712 … | 0712 … |
 Safaricom · Kenya | +254 712 … | 0712 … |
 Orange · Romania | +40 712 … | 0712 … |
 UTL · Uganda | +256 712 … | 0712 … |
 MobiFone · Vietnam | +84 712 … | 0712 … |
 SabaFon · Yemen | +967 712 … | 0712 … |
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.