South Korea phone number validator
How the phone number format works
- Format
- South Korea phone number in national or international (+82) format
- Example
- +821020000000
Things to watch for
- Accepts national or international (E.164, e.g. +82...) format
- Validated with Google's libphonenumber; confirms the number is possible/valid for this country, not that it is currently assigned or reachable
^[+]?[0-9 ()\-]{6,}$A South Korean mobile number is built from the unified 010 prefix plus eight more digits (010-1234-5678, 11 digits nationally). Older carrier-specific prefixes — 011, 016, 017, 018, 019 — used to exist side by side with 010 but have largely been consolidated into it. The leading 0 is a trunk prefix, dropped the instant +82 is added, so 010-1234-5678 becomes +821012345678 internationally: ten digits after the country code.
How this validator works
Type the number as dialled locally (010-1234-5678) or in full international form (+821012345678); this tool checks the 11-digit national length, the 0 prefix, and the 10 mobile code against South Korea’s real numbering plan using Google’s libphonenumber, entirely in your browser. The most common failure here is a kept leading 0 after +82 — typing +82010-1234-5678 instead of +821012345678 — which adds a digit and fails validation immediately.
What a pass doesn’t tell you
A pass confirms the number matches a real South Korean mobile shape — it doesn’t confirm the SIM is active or the line connected. A well-formed 010 number can still be unassigned or recently disconnected.
Scope: use this to catch a missing digit, an outdated carrier prefix typed by habit, or a leftover 0 after +82 before a number reaches a form or SMS platform — not as proof it’s reachable.
Content last reviewed 2026-07-07.
phone number FAQ
Why is a South Korean mobile number ten digits after +82, not eleven?
The leading 0 in 010-1234-5678 is a national trunk prefix, dropped the moment +82 is added — the correct international form is +821012345678, keeping the 10 that follows the stripped 0, ten digits after the country code in total.
Were South Korean mobile numbers ever prefixed differently?
Yes. Older carrier-specific prefixes like 011, 016, 017, 018, and 019 were once common but have been phased out in favor of a single unified 010 prefix for all new and migrated mobile numbers, simplifying the numbering plan considerably.
Does a valid check confirm a South Korean number is currently active?
No. It only confirms the digits match a real South Korean mobile pattern under KCC's numbering plan — not that the SIM is active or the line connected, which needs a carrier-side check this free tool doesn't perform.