0990 is not a country code. Numbers inside a country start like this: ALFA Telecom (Kyrgyzstan), Kalamayi, Xinjiang (China), IR-MCI (Iran), Movistar (Peru). 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 |
|---|---|---|
 ALFA Telecom · Kyrgyzstan | +996 990 … | 0990 … |
 Kalamayi, Xinjiang · China | +86 990 … | 0990 … |
 IR-MCI · Iran | +98 990 … | 0990 … |
 Movistar · Peru | +51 990 … | 0990 … |
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.