There is a way to find out whether anyone has opened a phone line in your name in Korea. It is free, and the services rest on a published ministerial notice. We opened the Ministry of Government Legislation's guidance on phone-line name theft and worked back to the provisions.
One distinction turned out to matter more than anything else: name theft and name lending lead to opposite outcomes.
⚠️⚠️⚠️ If name theft is accepted, the contract is cancelled and what you paid comes back. But name lending — where you handed over your own details — gets no remedy, and the lender is prosecuted too. The guidance lists "where the name holder lent their name to an acquaintance" as an express exclusion.
⭐⭐⭐ Three free services, three different jobs
Article 2(1) of the Notice on the content and procedure of the name-theft prevention service defines three of them. The names are similar enough that they get treated as one thing — they do different work.
| Service | As defined | Provision |
|---|---|---|
| Opening alert | "a service that notifies … by text message or registered post that a service contract has been concluded" — ⭐ those who cannot receive texts get registered post to their registered address | art. 2(1)1 |
| Subscription lookup | "look up whether any telecommunications service is subscribed under your own name" — for finding lines already open | art. 2(1)2 |
| Signup block | "restrict in advance another person concluding a service contract in the user's name" — for stopping it happening at all | art. 2(1)3 |
⭐⭐ There is a natural order. Use the lookup to see where you stand, the block to close the door, and the SMS and email alerts so that anything getting through still reaches you immediately. The guidance calls them "free public services."
⚠️ All of it runs through M-Safer (www.msafer.or.kr). ⭐ Signing up for the SMS and email alerts covers "newly subscribing to any telecommunications service in your name or receiving one by transfer of name" — so transfers are caught as well as new lines.
There is a duty on the carrier side too
Separately from anything you sign up for, the law puts obligations on the operators.
- Telecommunications Business Act art. 32-5(1) — the Minister of Science and ICT must build "a system necessary for verifying subscriber identity, to prevent service contracts concluded by improper means" and make it available to operators.
- Art. 32-4(2) — operators must verify identity, including for contracts concluded through agents and dealers, and may refuse to contract where the person is not who they claim or refuses verification.
⭐⭐ Lending your name is punished — at exactly half the level
| Conduct | Prohibited by | Penalty |
|---|---|---|
| Opening a line in another person's name on terms of providing or raising funds, and using it or using it to recover the funds | art. 32-4(1)1 | ⚠️ up to 3 years, or a fine up to 100M won (art. 95-2(2)) |
| Soliciting, brokering, mediating or advertising such contracts | art. 32-4(1)2 | ⚠️ up to 3 years, or a fine up to 100M won (art. 95-2(3)) |
| Relaying another person's communications or providing service for another's use (name lending) | art. 30, main text | up to 1 year, or a fine up to 50M won (art. 97(7)) |
⭐ Three times the prison term, twice the fine (3 years vs 1, 100M vs 50M — our arithmetic). The law is drawing a line between organised, cash-driven activation and lending your name to someone you know.
⚠️⚠️ You do not have to have opened the line yourself. The guidance cites a judgment: "receiving and using a line opened through another person likewise violates art. 32-4(1)1" (Seoul Central District Court, 26 May 2016, 2016No276).
⚠️⚠️ A real case is quoted too — someone was offered "a low-interest loan if you provide your personal details and complete identity verification for a phone activation," sent a photo of their ID, passed the carrier's verification, and was sentenced to two months' imprisonment. When a "loan" is attached to an ID request, that is name-lending recruitment.
If it happens — the sequence is fixed
The guidance says to notify the carrier immediately and report to the police (112). The report itself "requires verification of the name holder's ID and signature, so the victim must attend a nearby branch in person and complete the report form" — it cannot be done online.
| Stage | Handled by | What happens |
|---|---|---|
| Detection | call centre | confirm whether a line exists; direct you to a branch |
| Filing | ⚠️ you, in person at a branch | check subscription and debt records; complete the investigation request |
| Investigation | branch and dedicated team | ⭐ the line is terminated on the carrier's own authority; the point of sale is investigated |
| Decision | dedicated team | attribute fault; notify the final outcome |
Two documents are needed: an ID loss confirmation and a name-theft investigation request (handwritten and submitted for identity verification). The source is the Korea Communications Commission's "Tailored remedy standards for telecommunications services (mobile)" of 25 October 2018.
⭐ If accepted — "fees already paid (subscription fees, deposits or guarantee insurance premiums) are refunded, and billing for unpaid charges and remaining penalties is prohibited" (Consumer Dispute Resolution Standards, table 2, item 40(2)).
⚠️⚠️ MVNO lines go through a different channel — the guidance directs you to the Korea Communications Commission CS centre (1335) and the telecom complaints mediation centre (080-3472-119). How MVNOs work is covered in switching to an MVNO.
⭐ If the carrier rejects it — free mediation exists
A rejected or returned report is not the end. You can apply to the telecom complaints mediation centre, and it costs nothing.
- Applying — via the website (www.msafer.or.kr) or fax (02-580-0519)
- First mediation — the operator's records are requested, the circumstances of activation are established, and a proposal is drawn up (about 15 days)
- Review committee — if either side objects, a committee of specialists re-examines the facts (about 15 days)
⭐ Roughly a month for both stages (our addition). The guidance frames it as resolving the dispute "through mediation, without going through complicated litigation." ⚠️ With the caveat that "processing times may differ depending on the nature of the complaint."
Questions that remain
Does the lookup cover every operator?
The notice defines it as "whether any telecommunications service is subscribed under your own name." ⚠️ Which operators that reaches is not resolvable from the wording alone, so we do not claim it.
If I set a block, am I locked out too?
⚠️ We could not confirm the release procedure or how long it takes. The notice establishes only that a signup can be "restricted in advance."
I am already getting demands for unpaid bills.
The instruction is specific: "if you receive billing for unpaid charges on a service you did not subscribe to, or notice of credit-default registration, contact the carrier's call centre or branch and confirm the basic subscription details including the contract in advance" — then file at a branch.
What if a family member opened it?
⚠️ The guidance notes that name theft "mostly arises through family, friends and others close to the victim." But if you expressed an intention to open the line or handed over your details, it is name lending — the guidance lists "where the name holder expressed an intention to subscribe and a dealer signed on their behalf" as an exclusion.
What about account security generally?
Losing control of your phone number means losing your authentication channel. Two-factor and passkeys are in the password security guide, and data protection in the 3-2-1 backup rule. Unclaimed tax refunds work the same "check it yourself" way — see finding unclaimed refunds.
Sources
- ⭐⭐⭐ Ministry of Government Legislation, Easy-to-Find Practical Laws — "Mobile phone users > Phone line name theft" (page states as of 15 June 2026). Source for the definition of name theft, the three free services and their provisions, the identity-verification system, the three penalty provisions, the cited judgment, the four-stage reporting process, the required documents, the remedy under the Consumer Dispute Resolution Standards, the name-lending exclusions, the mediation procedure and timings, and the MVNO contact numbers — with the provisions cited alongside.
- ⭐⭐ Korean Law Information Center — statute — Telecommunications Business Act (in force 20 Nov 2026, Act no. 21652). Arts. 30, 32-4, 32-5, 95-2 and 97, cited by the page above, belong to this Act.
- Our own arithmetic — the 3x prison and 2x fine ratios and the roughly one-month mediation total (15 + 15 days).
What we could not confirm
- ⚠️⚠️ What the M-Safer lookup screen actually looks like. It requires identity verification, so we could not run it ourselves. That is why there is no "takes five minutes" or "you'll see a screen showing…" in this article — the earlier version's "5-minute check" had no basis and has been removed from the title and body.
- ⚠️⚠️ How to release a signup block, and how long that takes. Not in the notice.
- ⚠️ Which operators the lookup reaches. The notice says only "telecommunications service."
- ⚠️ Name-theft incidence statistics. The Ministry of Science and ICT press-release path is disallowed by its robots.txt, so we did not open it.
- ⚠️ The full text of the tailored remedy standards. The guidance cites a 2018 press release, so only the quoted portions are reproduced.
- Financial identity theft (accounts, cards) runs on a different regime and is out of scope here.
The order is look up, then block, then alert. And one line worth keeping: if someone offers a loan in exchange for your ID, that is name-lending recruitment — and the lender is prosecuted too.
As of July 2026 (guidance page as of 15 June 2026). Service definitions, penalty provisions, procedures and documents are the source verbatim; the penalty ratios and the added timings are ours. ⚠️ For your own case, contact the carrier's call centre and the mediation centre (msafer.or.kr).
