Korean prepaid SIM identity verification not working?｜Check your carrier, registration and PASS
No long-term contract is required. Service is available in periods of at least 30 days. Foreign customers can apply with a Residence Card or passport. If you do not top up for the next period, service is suspended and the number is later terminated under the carrier policy. Identity-verification availability can vary by registration details and the service used.
Using a prepaid SIM does not automatically mean that mobile identity verification is unavailable. Check the selected carrier, registered subscriber details, line status and the PASS app in order.
Mobile phone verification and a PASS certificate are different
- SMS or ARS phone verification: The service checks whether the name, date of birth or identifying information, carrier and phone number match the subscriber record.
- PASS app and PASS certificate: You need to register the PASS app and issue a certificate on a smartphone. Some MVNOs, line types or service providers may have restrictions.
If one method fails, it does not necessarily mean that every form of mobile verification is unavailable.
Check these items in order
- Select the carrier again. A prepaid MVNO line may require the “알뜰폰” option instead of the regular SKT, KT or LG U+ option. Select the correct network and MVNO provider.
- Enter the subscriber details exactly as registered. A verification request may not be sent if the name or identifying details do not match. Foreign customers should check the spelling, order and spacing of the registered English name.
- Check the validity period and SMS reception. Verification cannot be completed by text if the recharge period has expired, the line is restricted or the phone does not recognize the SIM.
- Restart the phone to recognize the SIM again. If another phone also fails to recognize it, the SIM or line status needs to be checked.
- Open the PASS app directly if no notification arrives. Notifications may not appear when permission is disabled, app notifications are blocked or the app has been deleted.
- If verification fails only on one website, check that service’s eligibility rules. Some services may restrict prepaid, MVNO or passport-registered lines.
Foreign customers may use mobile identity verification when the required conditions are met, but opening a line with a passport does not guarantee verification on every website. PASS also states that foreign users must be eligible for mobile phone verification and able to register the authentication app.
What to check immediately after activation
- The network and MVNO provider used for activation
- Whether the new number can make calls and receive SMS messages
- Whether the entered name exactly matches the registered name
- After repeated failures, whether the service supports prepaid or MVNO lines
Saessak Mobile in Seomyeon, Busan
Bring the prepaid number that is having verification problems and the phone you will use. Korean customers should bring a national ID card or driver’s license. Foreign customers should bring an Alien Registration Card or passport so the subscriber details and line status can be checked.
- Address: 부산광역시 부산진구 새싹로 28
- Phone: 010-6386-9959
- Hours: Monday–Saturday 10:00–20:00
- Closed Sunday
References: PASS official FAQ, PASS official information and KT prepaid SIM recognition guide. The latest rules of the carrier, MVNO and service requesting verification take priority.