015 is not a country code. Numbers inside a country start like this: Yerevan (Armenia), Sabac (Serbia), Delft (Netherlands), Águia da Castelo - SP (Brazil) 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 |
|---|---|---|
 Yerevan · Armenia | +374 15 … | 015 … |
 Sabac · Serbia | +381 15 … | 015 … |
 Delft · Netherlands | +31 15 … | 015 … |
 Águia da Castelo - SP · Brazil | +55 15 … | 015 … |
| Alambari - SP · Brazil | +55 15 … | 015 … |
| Angatuba - SP · Brazil | +55 15 … | 015 … |
| 55 more in Brazil | ||
 Mechelen · Belgium | +32 15 … | 015 … |
 Smart · Cambodia | +855 15 … | 015 … |
 10th of Ramadan · Egypt | +20 15 … | 015 … |
| TE · Egypt | +20 15 … | 015 … |
 Mikkeli · Finland | +358 15 … | 015 … |
 Teshikaga, Hokkaido · Japan | +81 15 … | 015 … |
 Tune Talk · Malaysia | +60 15 … | 015 … |
 Northern and Eastern Limpopo/Polokwane · South Africa | +27 15 … | 015 … |
| Vodacom · South Africa | +27 15 … | 015 … |
 Khartoum · Sudan | +249 15 … | 015 … |
| Khartoum North · Sudan | +249 15 … | 015 … |
| Khartoum Rural · Sudan | +249 15 … | 015 … |
| 1 more in Sudan | ||
 Dara · Syria | +963 15 … | 015 … |
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.