This free South Korean phone number checker shows whether a number is valid.
A South Korean phone number checker tells you whether a number is real, which means it follows South Korea's numbering rules and is assigned. Enter a +82 number above and 1Lookup's free checker returns valid or invalid in seconds, with the line type and country, checked against South Korea's numbering plan.
Pick the country, then enter the number without the country code.
Free & rate-limited. No signup required to try.
- Country code
- +82
- Mobile numbers
- 9 to 10 digits after +82, starting 01
- Landlines
- 5, 6, 8, 9 or 10 digits after +82, starting 02, 03, 04, 05 or 06, such as +82Â 2Â XXXXÂ XXXX
- Written at home
- 010-2000-0000
- Written for apps and SMS
- +821020000000
- Dialed from the US
- 011 82 10 2000 0000
A South Korean mobile number is +82 followed by 9 to 10 digits, and the first one is 1.
Written with the country code
- +82Country code
- 1Mobile start
- 0 2000 00009 more digits
Written at home
- 0Replaces +82
- 1Mobile start
- 0 2000 00009 more digits
The +82 and the 0 do the same job, so a number is never written with both.
A South Korean phone number checker reads a number's format first and then checks it against South Korea's numbering plan.
This is the path one check takes. A number can be written correctly and still not be assigned to anyone, so the format check alone is not the answer.
- You enter the numberType it the way it is written at home, such as 010-2000-0000, or paste it with +82.
- Its format is checkedEach type of number has its own rules. A mobile needs 9 to 10 digits after +82 and starts with 01 at home.
- It is checked against the numbering planNumbers outside the US and Canada are checked against the numbering plan of their country, which for this page is South Korea's.Nothing is sent to the number, so it never rings and its owner is never told.
- You see valid or invalidWith the line type and country in a few seconds, and the carrier or network where one is listed.
A South Korean mobile number has 9 to 10 digits after +82 and starts with 01, so any other length is not a valid mobile.
These lengths come from the numbering data for South Korea.
| Number type | Starts with at home | Digits after +82 | Written at home |
|---|---|---|---|
| Mobile | 01 | 9 to 10 | 010-2000-0000 |
| Landline | 02, 03, 04, 05 or 06 | 5, 6, 8, 9 or 10 | 02-XXXX-XXXX |
Three common mistakes make a South Korean number fail the check, and each one is quick to fix.
Keeping the 0 after +82 adds a digit.
The 0 is only for dialing inside South Korea, so +82 010 2000 0000 is wrong. Drop the 0 and write +82 10 2000 0000.
Typing too few or too many digits makes a number invalid.
A mobile number has 9 to 10 digits after +82. With fewer than 9 or more than 10 it cannot be a valid mobile, and inside that range the first digits decide how many are needed, so look for a missing or doubled digit.
Leaving the wrong country selected changes how the number is read.
The checker reads a number by the rules of the country selected above, so keep South Korea selected for a +82 number. Paste a number with its + and country code and the country is read from the number itself.
These are the questions people ask most about checking South Korean phone numbers.
How do I check if a South Korean phone number is valid?
Enter the number in the box above with South Korea selected. The free checker returns valid or invalid in seconds, with the line type and country. Type it the way it is written at home, such as 010-2000-0000, or in full as +82 10 2000 0000.
How many digits is a South Korean phone number?
A mobile number has 9 to 10 digits after +82. A landline has 5, 6, 8, 9 or 10 digits after +82, such as +82 2 XXXX XXXX.
What does a South Korean mobile number start with?
Mobile numbers start with 01 at home, which is 1 after +82. The next digit is 0, 1, 2, 6, 7, 8 or 9.
How do I write a South Korean number for an app or an SMS tool?
Use the E.164 form: a plus sign, 82, then the number without its leading 0 and no spaces, such as +821020000000.
Does the South Korean phone number checker show the carrier?
It shows the carrier or network where one is listed. Numbers outside the US and Canada are checked against the numbering plan of their country rather than live carrier data, so some come back with no carrier name.
Does valid mean the South Korean number is active?
No. Valid means the number is real, correctly written for South Korea and assigned. Whether a line is switched on and reachable right now is a different question, and the free HLR lookup answers it.
Can I check a whole list of South Korean phone numbers?
Yes. This free tool checks one number at a time. A 7-day free trial opens CSV upload and the API, at 1 credit a number.
Does the person know I checked their number?
No. The check reads records only. No call or text goes to the number, so its owner is never told.
What are the landline area codes of Seoul, Busan and Incheon?
At home the codes are 02 for Seoul, 051 for Busan and 032 for Incheon. From abroad the 0 is dropped, so Seoul is +82 2. The area code is part of a landline's digits, and a mobile number has none.
You can check numbers from other countries on their own pages.
- +61Australian phone number checker
- +1Canadian phone number checker
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These free tools answer the next question about a number.
- The +82 country code pageHow to dial South Korea, the time there now and the landline places.
- HLR lookupCheck whether a mobile number is switched on and reachable right now.
- Line type lookupSee whether a number is a mobile, a landline or VoIP.
- Carrier lookupFind the carrier or network behind a number.
- Phone validator for any countryThe same check with the country picker open to every country.
- Phone validation APIRun the same check from your own software, one request per number.
Sources: Google's libphonenumber numbering data for lengths, mobile starts and landline starts, as of September 24, 2026; the ITU list of country codes.