South Korean Phone Number Format: Dialing Steps & Examples

South Korean phone number formats consist of a country code (+82), an area code or network prefix, and a local subscriber number.

What elements are included in a South Korean phone number format?

South Korea’s number format varies depending on whether you’re calling on a landline or a mobile device. The structure is highly logical, ensuring that every digit serves a specific purpose in routing your call correctly.

South Korea phone number format: +82 2-XXX (X)-XXXX (landline) or +82 10-XXXX-XXXX (mobile)

1. Country code: +82

South Korea’s country code is +82. You only need it when dialing from outside South Korea. This identifies South Korea as the destination country for the international telephone network. 

In the domestic South Korean system, almost every number begins with a 0. So, for domestic calls, drop the + and the 82, and replace it with a leading 0.

Note: When dialing internationally (using +82), you must drop this leading 0.

2. Trunk code:0

The trunk code in South Korea is 0. It is used at the beginning of a phone number when making domestic call or calls within South Korea. It signals to the network that the call is going to a different area or network within the country.

Key rules for the trunk code:

• Always used for domestic calls: 02-XXXX-XXXX, 010-XXXX-XXXX
• Always dropped when dialing internationally:  +82 2-XXXX-XXXX (the 0 is removed)
• Never used alongside the country code (+82)

3. Area code or Network prefix

The digits that follow the country code identify either the geographic region (for landlines) or the service type (for mobile numbers). They are part of the full number and are not dialed separately.

Landline area codes are tied to specific cities and regions:

• 1–2 digits for major cities (e.g., 2 for Seoul, 51 for Busan)
• 2 digits for most metropolitan regions (e.g., 32 for Incheon, 53 for Daegu)

Mobile network prefixes all begin with 01X and are not linked to any geographic location:

• 010:  the current standard prefix for all mobile numbers in South Korea
• 011, 016, 017, 018, 019:  legacy prefixes, no longer issued to new users but still active on some older lines

4. Subscriber number

The remaining digits in the South Korean phone number format are the unique subscriber number, typically 7 or 8 digits long. 

For landline numbers:

• Area code-XXX-XXXX: older or shorter local numbers (7 digits total after the area code)
• Area code-XXXX-XXXX: the standard modern format (8 digits total after the area code)

For mobile numbers:

• 010 prefix: the subscriber number is always 8 digits in a fixed 4+4 format

Note: The older 7-digit local numbers (XXX-XXXX) still exist in some places, but many areas now use 8-digit subscriber numbers (XXXX-XXXX) regardless of area code length.

What are the types of Korean phone numbers – format, structure, and examples

Each South Korean phone number serves a different purpose, follows its own format, and comes with specific dialing rules. Here’s a complete breakdown of the different types of Korean phone numbers.

1. Landline Numbers (Fixed-Line Numbers)

Landline numbers are tied to specific geographic regions. They use a 1 or 2-digit area code (after the initial trunk code 0). Major cities like Seoul use a single digit (2), while provinces use two digits (e.g., 51 for Busan).

South Korean landline number format: 0[area code]-[subscriber number] (domestic) or  +82 [area code]-[subscriber number] (international)

South Korea phone number format example: +82 53-850-5000

• 82: South Korea country code
• 53: Daegu area code
• 850-5000: Subscriber number
• Korean phone number domestic format: 053-850-5000
• Korean phone number international format: +82 53-850-5000

2. Mobile phone numbers

South Korean mobile numbers all use the network prefix 010, which replaced older legacy prefixes (011, 016, 017, 018, 019) as part of a national standardization. New SIM cards are only issued with the 010 prefix today, though some older lines still carry legacy prefixes.

Mobile numbers are 11 digits long domestically and always follow a fixed 4+4-digit pattern for the subscriber number.

South Korean mobile number format: 010-XXXX-XXXX (domestic) or +82 10-XXXX-XXXX (international)

South Korea mobile phone number format example: +82-10-306-5050 

• 82: South Korea country code
• 10: Mobile prefix
• 306-5050: Subscriber number
• Korean cell phone number domestic format: 010-306-5050
• Korean cell phone number international format: +82-10-306-5050 

3. Toll-free numbers

South Korean toll-free numbers start with the prefix 080 and are free to call from any landline or mobile phone within South Korea. These non-geographic numbers are commonly used by customer service centers, government agencies, and large businesses. 

Toll-free numbers cannot be reached from outside South Korea; they only work on domestic networks.

South Korean toll-free number format: 080-XXX-XXXX

Korean toll-free number format example: 080-694-4478

• 080: Toll-free prefix
• 694-4478: Subscriber number
• Korean toll-free number domestic format: 080-694-4478
• Korean toll-free number international format: Not available

4. Special service numbers

South Korea uses short-code special service numbers for emergencies, government services, and public utilities. These are typically 3 digits and do not follow the standard area code + subscriber number format. They can be dialed from any phone within South Korea without any prefix.

Note: Dialing these numbers from abroad is generally not supported. You must use the full local office number instead.

5. Virtual phone numbers

Virtual phone numbers are cloud-based numbers not tied to any physical SIM card or fixed location. Businesses use them to establish a local Korean presence, route calls to international teams, or manage customer calls through VoIP systems. They typically mirror the format of standard landline or mobile numbers.

South Korean virtual phone numbers format: Follows standard landline or mobile formatting, depending on the number assigned

6. Vanity numbers

Vanity numbers are customized phone numbers that spell out a word or a memorable sequence. These numbers are chosen for their memorability. They follow the standard landline or mobile number structure but feature repeating or lucky-digit patterns.

South Korean vanity number format: Standard Area/Mobile Code + Repeating Digit Patterns

Example:

• Korean phone number domestic format: 02-777-7777 or 010-8888-8888
• Korean phone number international format: +82 2-777-7777

South Korea country code and complete area code directory

South Korea’s country code is +82, which you use when dialing a Korean number from outside the country. In South Korea, each city and province has its own area code that indicates where a landline number is registered. 

Here is the common area code directory:

Note: Seoul is the only city in South Korea with a single-digit area code (2). All other regions use two-digit area codes.

How to call a Korean phone number – step-by-step instructions

Follow these simple steps to call a South Korean phone number and ensure it connects every time.

Calling a Korean number from within South Korea (Domestic calls)

From  a landline (telephone)

• Calling a local number (same city):

1. Pick up the receiver and wait for the dial tone
2. Dial the 7 or 8-digit subscriber number without the area code

• Calling a landline in a different city:

1. Pick up the receiver and wait for the dial tone
2. Dial 0 (trunk code) + area code of the destination city
3. Dial the subscriber number

• Calling a mobile number from a landline:

1. Pick up the receiver and wait for the dial tone
2. Dial 010 (or the legacy prefix if applicable)
3. Dial the 8-digit subscriber number

From a mobile phone

• Calling another mobile number:

1. Open the dialer on your phone
2. Dial 010 + the 8-digit subscriber number
3. Press call

• Calling a landline: 

1. Open the dialer on your phone
2. Dial 0 + area code + subscriber number
3. Press call

Calling a Korean number from outside South Korea (International calls)

From a landline (telephone)

1. Pick up the receiver and wait for the dial tone
2. Dial your country’s international exit code
   • USA / Canada: 011
   • UK / Europe: 00
   • Australia: 0011
3. Dial South Korea’s country code: 82
4. Dial the area code or network prefix and drop the leading 0
5. Dial the subscriber number and press call

From a mobile phone

1. Open the dialer on your phone
2. Press and hold 0 until the + sign appears (or type + directly on some phones)
3. Dial South Korea’s country code: 82
4. Dial the area code or mobile prefix without the leading 0
5. Dial the subscriber number and press call

For quick reference:

What is the best time to call South Korea from other countries?

South Korea follows Korea Standard Time (KST), which is UTC+9. Unlike many countries, it does not observe daylight saving time, so the time difference remains consistent year-round. However, countries that observe DST may experience a 1-hour shift in their time difference between seasons.

Standard business hours in South Korea run from 9:00 AM to 6:00 PM KST, Monday through Friday. Use the chart below to find the best local time to call from your country so your call lands during those active hours.

Note: Tokyo and Seoul share the same time zone, so 9 AM in Japan is also 9 AM in South Korea.

How to verify a Korean phone number?

To verify a Korean phone number, you can either manually review the format yourself or use an online tool to do the heavy lifting.

Manual validation checklist 

Go through this checklist before using any South Korean phone number:

1. Check the country code: A valid international Korean number must begin with +82 or the [exit code] + 82. If the number starts with anything else, then it’s not a Korean number.
2. Verify the trunk code: When a number is written in international format (+82), the leading 0 of the area code or mobile prefix must be removed. 
3. Confirm the area code or mobile prefix is valid: Cross-check the area code against the South Korea area code directory.
4. Count the total digits: South Korean phone numbers follow strict digit lengths:

• Seoul landlines: 9-10 digits total (including area code, excluding country code)
• Regional landline: 10 digits total
• Mobile: 11 digits total (010 + 4+ 4)

5. Watch out for placeholder numbers: Numbers like 010-0000-0000, 010-1111-1111, or 010-1234-5678 are commonly used as placeholders in forms and are not real assigned numbers. Avoid saving or dialing these.

Online validation tools

For faster and more thorough checks, these online tools can help verify whether a South Korean number is valid, active, or properly formatted: 

Note: Online tools can confirm format validity and sometimes carrier information, but they cannot always confirm whether a number is currently active or assigned to a specific person. For the most accurate results, combine manual checks with an online tool.

What are the common mistakes to avoid when dialing South Korean numbers?

Here are the 5 most common mistakes people make when dialing South Korean numbers and how to avoid them:

1. Keeping the trunk code when dialing internationally

One of the most frequent mistakes is leaving the 0 at the start of the area code or mobile prefix when dialing from outside South Korea. 

The trunk code (0) is only used for domestic calls. When dialing internationally, drop the 0 and replace it with +82.

2. Using the wrong country code

Some callers mistakenly dial +82 for other countries or confuse it with similar-looking codes like +81 (Japan) or +86 (China). 

Always double-check that you are dialing +82 specifically for South Korea before proceeding.

3. Misreading legacy mobile prefixes as invalid

South Korea historically used multiple mobile prefixes, such as 011, 016, 017, 018, and 019, before standardizing to 010. 

Some callers assume these older prefixes are errors and try to correct them to 010, resulting in a wrong number. If a contact has a legacy prefix, dial it as given, as those local phone numbers are still active on older lines.

4. Forgetting the exit code

If you are dialing South Korea from abroad, you must enter your own country’s international exit code before dialing the South Korean country code (+82). For example, if you are calling from the US or Canada, you need to dial 011 first. 

However, on most modern smartphones, you can simply press and hold the 0 key to produce a + symbol, which automatically replaces the exit code regardless of your location.

5. Ignoring time difference

While not a technical dialing error, a major mistake is miscalculating the time. From New York at EST (UTC-5), South Korea is 14 hours ahead. Because the time difference is so significant, your morning is their late night, and your evening is their next morning. 

To prevent time zone mishaps, add Seoul to your smartphone’s world clock widget for an instant visual reference or always check the time before actually calling or sending an SMS in South Korea.

Conclusion 

South Korean phone numbers follow a structured format, and understanding the correct country code, area codes, mobile prefixes, and dialing rules can help you avoid common calling mistakes.

Whether you’re making personal or business calls, using the right format ensures your calls connect smoothly within and outside South Korea.

For businesses that frequently communicate with Korean customers, having a dedicated Korean toll-free number from KrispCall can also make customer support more accessible and professional.