020 is not a country code. Numbers inside a country start like this: Agdash (Azerbaijan), London (United Kingdom), Guangzhou, Guangdong (China), Pune, Maharashtra (India) 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 |
|---|---|---|
 Agdash · Azerbaijan | +994 20 … | 020 … |
| Agsu · Azerbaijan | +994 20 … | 020 … |
| Barda · Azerbaijan | +994 20 … | 020 … |
| 7 more in Azerbaijan | ||
 London · United Kingdom | +44 20 … | 020 … |
 Guangzhou, Guangdong · China | +86 20 … | 020 … |
 Pune, Maharashtra · India | +91 20 … | 020 … |
 Novi Pazar · Serbia | +381 20 … | 020 … |
 Amsterdam · Netherlands | +31 20 … | 020 … |
 Kabul · Afghanistan | +93 20 … | 020 … |
 Dubrovnik-Neretva · Croatia | +385 20 … | 020 … |
 Telecel · Ghana | +233 20 … | 020 … |
 Nairobi · Kenya | +254 20 … | 020 … |
 Beeline · Laos | +856 20 … | 020 … |
| Best Telecom · Laos | +856 20 … | 020 … |
| ETL · Laos | +856 20 … | 020 … |
| 2 more in Laos | ||
 Sidiessaiah · Libya | +218 20 … | 020 … |
| Suk Elkhamis · Libya | +218 20 … | 020 … |
 Ambatondrazaka · Madagascar | +261 20 … | 020 … |
| Ambositra · Madagascar | +261 20 … | 020 … |
| Antananarivo · Madagascar | +261 20 … | 020 … |
| 17 more in Madagascar | ||
 Danilovgad/Kolasin/Podgorica · Montenegro | +382 20 … | 020 … |
 Callplus · New Zealand | +64 20 … | 020 … |
| Sure (Guernsey) New Zealand Limited · New Zealand | +64 20 … | 020 … |
| Vodafone · New Zealand | +64 20 … | 020 … |
| 1 more in New Zealand | ||
 Dangamvura · Zimbabwe | +263 20 … | 020 … |
| Mutare · Zimbabwe | +263 20 … | 020 … |
| Odzi · Zimbabwe | +263 20 … | 020 … |
| 1 more in Zimbabwe | ||
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.