0343 is not a country code. Numbers inside a country start like this: Durgapur, West Bengal (India), Marijampolė (Lithuania), Driebergen-Rijsenburg (Netherlands), Paraná, Entre Ríos (Argentina) 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 |
|---|---|---|
 Durgapur, West Bengal · India | +91 343 … | 0343 … |
 Marijampolė · Lithuania | +370 343 … | 0343 … |
 Driebergen-Rijsenburg · Netherlands | +31 343 … | 0343 … |
 Paraná, Entre Ríos · Argentina | +54 343 … | 0343 … |
 Pasuruan · Indonesia | +62 343 … | 0343 … |
 Ialomița · Romania | +40 343 … | 0343 … |
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.