Phone & Internet in Korea
Last updated: October 9, 2026 · KISA mobile identity-verification guidance and LG U+ tourist-SIM limits rechecked
Illustrative phone-use photo · Nenad Stojković / Wikimedia Commons · CC BY 2.0 · Cropped for display
If Korean phone verification fails, start with the point where the screen stops.
A rejected request, a missing SMS and a failed PASS authentication can have different causes. Before changing your name format or phone settings, check whether your mobile plan supports the type of verification the service requires.
| What You See | Check First |
|---|---|
| Rejected before an SMS is sent | Plan eligibility, subscriber information, carrier/MVNO, registered name |
| SMS requested, but no message arrives | Number, SMS function, blocked messages, carrier |
| Code arrives, but verification still fails | Code validity, subscriber record, service eligibility |
| PASS fails | Whether the service offers carrier-based SMS general authentication |
1. First Check Whether Your SIM Supports Formal Identity Verification
A Korean phone number doesn't automatically provide Korean mobile identity verification.
LG U+'s visitor guidance, for example, says its Voice/SMS tourist products can receive SMS verification used by some restaurant and taxi reservation services, while identity verification for banking or government services isn't supported. Its data-only tourist products don't provide SMS verification.
Ordinary SMS code
A service sends a code to a phone number it accepts.
Formal Korean mobile identity verification
An approved verification process checks the mobile subscriber's registered identity. It may use SMS or the PASS app.
The distinction matters because receiving a text message doesn't prove your mobile account is eligible for formal identity verification.
KISA describes SMS general authentication and PASS app authentication as two methods of formal mobile identity verification. The SMS method still checks the subscriber information; it's not the same as an ordinary text-code login used by some apps.
If the tourist product doesn't support formal identity verification, changing the spelling of your name or reinstalling PASS won't add that function.
LG U+ — Visitor SIM and Verification Functions →
2. Rejected Before the SMS Screen
If the form rejects your request before sending a code, check the information tied to the mobile subscription.
Select the carrier or mobile virtual network operator that actually provides your line.
Foreigner / Korean
Use the status that matches your account and the verification form.
Subscriber
The mobile line normally needs to be registered to the person being verified.
Registered English name
Use the name stored for your mobile subscription, not a guessed spelling or name order.
Passport first, Residence Card later
Some foreign residents open a mobile line with a passport and receive a Residence Card later. Don't assume the subscriber record changes automatically.
Ask the carrier how the information used for mobile identity verification is currently registered for that line.
"I opened this number with my passport. I now have a Residence Card. Can you check how my subscriber information is registered for mobile identity verification?"
한국어
여권으로 개통했고 지금은 외국인등록증이 있습니다.
휴대폰 본인인증에 사용하는 가입정보가 현재 어떻게 등록되어 있는지 확인해 주세요.
The carrier can check whether the mobile account's registration details need an update. Don't assume that having a Residence Card automatically makes every verification service available.
Check the exact registered English name
Spaces, hyphens and name order can matter when foreign names move between identity documents and Korean account systems.
SMITH JOHN MICHAEL
JOHNMICHAELSMITH
These are examples of possible name formats, not instructions to try each one.
Ask the carrier for the exact name stored for verification instead of repeatedly entering different combinations.
공백과 하이픈도 같이 확인해 주세요.
3. SMS Was Requested but Never Arrived
If the verification request was accepted but no code arrives, check the SMS path.
Blocked or spam messages
Whether the current plan can receive the required SMS
Whether SMS from other Korean services is arriving
On a Dual SIM phone, make sure the line associated with the number is enabled and can receive messages.
If verification messages from several Korean services fail, ask the carrier to check SMS reception on the line.
If only one site fails while other Korean messages arrive normally, the remaining problem may belong to that service.
Don't repeatedly request new codes in quick succession. Some services limit how many verification attempts they allow within a short period.
4. The Code Arrived but Verification Still Failed
An arriving SMS confirms that the phone can receive the code. It doesn't prove that the service has accepted the subscriber's identity.
First check that you entered the latest code before its expiration time. If that isn't the issue, check the subscriber information and the eligibility rules of the service where verification fails.
Passport or Residence Card information used for the line
Carrier or MVNO selection
Foreigner / Korean selection
The service's eligibility for foreign users
At this stage, subscriber information and service eligibility come before APN or mobile-data troubleshooting.
If you've changed your name, identification document or mobile carrier, ask whether the subscriber information used for verification matches your current registration.
If the carrier confirms the record but only one website continues to reject verification, contact that service and ask about its foreign-user eligibility and accepted verification methods.
5. PASS Fails — or Every Service Fails
KISA describes two common methods of formal mobile identity verification: SMS general authentication and PASS app authentication.
If PASS itself is the problem, look for an option such as:
Verify by SMS
This option is useful when the service provides carrier-based SMS authentication and your mobile subscription is eligible for it.
Changing from PASS to SMS doesn't fix an unsupported tourist SIM or mismatched subscriber record.
If several Korean services fail in the same way, ask the carrier to check the mobile account directly. If only one service fails after the carrier confirms the record, check that service's foreign-user policy.
휴대폰 본인인증이 계속 실패합니다.
제 번호가 제 명의와 현재 등록정보로 어떻게 등록되어 있는지 확인해 주세요.
본인인증에 사용하는 영문 이름도 공백과 하이픈까지 알려주세요.
If the service offers another official verification method, such as an accepted certificate or identification procedure, check that option with the service provider rather than trying unofficial workarounds.
KISA — Official Mobile Identity Verification Methods →
KISA's official guide illustrates the SMS general-authentication and PASS app authentication processes. Both are formal mobile identity-verification methods.
Choose carrier → Enter subscriber details → Receive SMS code → Complete verification
PASS App Authentication
Choose carrier → Open PASS → Authenticate in the app → Complete verification
The official KISA educational video is narrated in Korean. The explanation above is provided in English for international readers.
Open KISA's Official Educational Guide →If the remaining problem belongs to one particular Korean app or service, continue with Korean Apps Without a Korean Phone Number: Maps, Taxis, Booking & Delivery →
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aespa's official music video for "Whiplash," released through SMTOWN.
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The National Gugak Center Folk Music Group performs samulnori, featuring four traditional Korean percussion instruments: kkwaenggwari, janggu, buk and jing.
Open on YouTube →Factual checks: KISA's official mobile identity-verification guidance and LG U+ visitor-SIM information, rechecked October 9, 2026. Verification screens, supported authentication methods and carrier registration procedures can vary. Contact the carrier or service provider for account-specific problems.