0373 is not a country code. Numbers inside a country start like this: Mtskheta (Georgia), Xinxiang, Henan (China), Dibrugarh, Assam (India), Krutje/Bubullimë/Allkaj, Lushnjë (Albania) 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 |
|---|---|---|
 Mtskheta · Georgia | +995 373 … | 0373 … |
 Xinxiang, Henan · China | +86 373 … | 0373 … |
 Dibrugarh, Assam · India | +91 373 … | 0373 … |
 Krutje/Bubullimë/Allkaj, Lushnjë · Albania | +355 373 … | 0373 … |
 Dompu · Indonesia | +62 373 … | 0373 … |
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.