0237 is not a country code. Numbers inside a country start like this: Araks/Armavir/Hoktember/Lenughi/Metsamor/Zartonk, Armavir (Armenia), Straseni (Moldova), Moreno, Buenos Aires (Argentina), Murayama, Yamagata (Japan) 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 |
|---|---|---|
 Araks/Armavir/Hoktember/Lenughi/Metsamor/Zartonk, Armavir · Armenia | +374 237 … | 0237 … |
| Armavir · Armenia | +374 237 … | 0237 … |
| Armavir/Mrgashat · Armenia | +374 237 … | 0237 … |
| 8 more in Armenia | ||
 Straseni · Moldova | +373 237 … | 0237 … |
 Moreno, Buenos Aires · Argentina | +54 237 … | 0237 … |
 Murayama, Yamagata · Japan | +81 237 … | 0237 … |
| Sagae, Yamagata · Japan | +81 237 … | 0237 … |
 Vrancea · Romania | +40 237 … | 0237 … |
 Federal Dependencies · Venezuela | +58 237 … | 0237 … |
 Thanh Hoa Province · Vietnam | +84 237 … | 0237 … |
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.