0528 is not a country code. Numbers inside a country start like this: Trakai (Lithuania), Hoogeveen (Netherlands), Purukcahu (Indonesia), Färgelanda (Sweden). 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 |
|---|---|---|
 Trakai · Lithuania | +370 528 … | 0528 … |
 Hoogeveen · Netherlands | +31 528 … | 0528 … |
 Purukcahu · Indonesia | +62 528 … | 0528 … |
 Färgelanda · Sweden | +46 528 … | 0528 … |
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.