04 is not a country code. Numbers inside a country start like this: Dubai (United Arab Emirates), Haifa and North Regions (Israel), Tirana (Albania), Liège (Belgium) 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 |
|---|---|---|
 Dubai · United Arab Emirates | +971 4 … | 04 … |
 Haifa and North Regions · Israel | +972 4 … | 04 … |
 Tirana · Albania | +355 4 … | 04 … |
 Liège · Belgium | +32 4 … | 04 … |
 Guayas · Ecuador | +593 4 … | 04 … |
| Loja/El Oro/Zamora Chinchipe · Ecuador | +593 4 … | 04 … |
| Manabí/Los Ríos/Galápagos · Ecuador | +593 4 … | 04 … |
 Kamogawa, Chiba · Japan | +81 4 … | 04 … |
| Kashiwa, Chiba · Japan | +81 4 … | 04 … |
| Tokorozawa, Saitama · Japan | +81 4 … | 04 … |
 Orange · Jordan | +962 4 … | 04 … |
 Paraparaumu · New Zealand | +64 4 … | 04 … |
| Wellington · New Zealand | +64 4 … | 04 … |
| Wellington/Hutt Valley · New Zealand | +64 4 … | 04 … |
 Haeju · North Korea | +850 4 … | 04 … |
| Kaesong · North Korea | +850 4 … | 04 … |
| Sariwon · North Korea | +850 4 … | 04 … |
 Bitola/Demir Hisar/Resen · North Macedonia | +389 4 … | 04 … |
 Jenin · Palestinian Territories | +970 4 … | 04 … |
 Kranj · Slovenia | +386 4 … | 04 … |
 Garowe · Somalia | +252 4 … | 04 … |
 Taichung/Changhua · Taiwan | +886 4 … | 04 … |
 Ibb · Yemen | +967 4 … | 04 … |
| Taiz · Yemen | +967 4 … | 04 … |
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.