What are International Dialing Codes and How to Use Them?
International dialing codes are uniquely assigned telephone number prefixes for each country, used to distinguish between calling and receiving countries in international calls. For example, South Korea's country code is +82, the United States is +1, Japan is +81, and China is +86. When making international calls, you first dial an international access code (in Korea: 001, 002, 00700, etc.) before the country code, or use the + symbol on mobile phones. International dialing codes are managed by the International Telecommunication Union (ITU) and range from 1 to 3 digits according to the E.164 standard. Currently, over 200 countries and territories worldwide use unique country codes.