What Is a Country Calling Code?
A country calling code (also known as a country dial-in code or international dialing prefix) is a numerical prefix used when dialing a telephone number in another country. These codes are standardized by the International Telecommunication Union (ITU) under the E.164 numbering plan. Every country or territory in the world has at least one unique code.
How International Calling Works
To place an international call, you typically dial in this order:
- Exit code (IDD): The international access code for your country (e.g., 011 in the US, 00 in most of Europe, or simply + from a mobile).
- Country code: The numeric code for the destination country.
- Area/city code: The regional code within that country (if applicable).
- Local number: The subscriber's individual number.
For example, to call a London number from the US: 011 + 44 + 20 + 7XXX XXXX
Major Country Codes at a Glance
| Country | Code | Example Format |
|---|---|---|
| United States / Canada | +1 | +1 (212) 555-0100 |
| United Kingdom | +44 | +44 20 7946 0958 |
| Germany | +49 | +49 30 12345678 |
| France | +33 | +33 1 23 45 67 89 |
| Australia | +61 | +61 2 9876 5432 |
| India | +91 | +91 98765 43210 |
| China | +86 | +86 10 8765 4321 |
| Brazil | +55 | +55 11 91234-5678 |
| South Africa | +27 | +27 11 123 4567 |
| Japan | +81 | +81 3-1234-5678 |
The "+" Symbol Explained
On mobile phones, the + symbol replaces the need to know your country's specific exit code. When you press and hold the "0" key on most phones, a "+" appears. This tells the network to automatically insert the correct international access code for wherever you are calling from. It's the most reliable way to dial internationally.
How to Decode an Unknown Foreign Number
If you receive a call from an international number, here's how to decode it:
- Check whether the number starts with + or 00 — this signals an international call.
- Look up the digits immediately following the + to find the country code (e.g., +44 = UK, +33 = France).
- Use the ITU's online database or a reverse lookup service to narrow down the region further.
Country Code Zones
The ITU organizes country codes into world zones numbered 1–9:
- Zone 1: North America and Caribbean (NANP countries)
- Zone 2: Africa
- Zone 3 & 4: Europe
- Zone 5: South America
- Zone 6: Oceania
- Zone 7: Russia and Kazakhstan
- Zone 8: East Asia and special services
- Zone 9: Middle East and Central Asia
Tips for Calling Internationally
- Always use the + format when saving international numbers in your phone.
- Drop the leading 0 from a local number when dialing internationally (e.g., UK's 020 becomes +44 20).
- Check your carrier's international rates or use VoIP services for cost savings.
- Be aware of time zones — check local time before calling abroad.