0713 is not a country code. Numbers inside a country start like this: Huanggang, Hubei (China), Prabumulih/Talang Ubi (Indonesia), Orange (Romania). 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 |
|---|---|---|
 Huanggang, Hubei · China | +86 713 … | 0713 … |
 Prabumulih/Talang Ubi · Indonesia | +62 713 … | 0713 … |
 Orange · Romania | +40 713 … | 0713 … |
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.