Korean SIM Before a Bank Account: Store Inquiry Sheet
Official KT pages checked 25 October 2026. This is an independent inquiry sheet, not a carrier application form.
No Korean bank account yet? Before buying a SIM, ask about three different things: opening the line, paying or topping it up, and using it for identity verification.
I would get those answers for the exact product before paying. A working phone number does not by itself establish that a bank or public service will accept it for identity checks.
What the official pages establish
KT’s required-documents guide says a standard passport can be used for a prepaid line. It lists retailer and other top-up channels; its postpaid section lists automatic payment from a Korean bank account or Korean credit card. A listed channel is not proof that your particular foreign card or cash payment will be accepted.
KT’s general requirements page also states that at least 90 days must remain on your visa. Ask the store which document and remaining-stay requirements apply to the exact product.
The LTE Welcome Prepaid page says service without a registered foreigner identification number is limited to 90 days and that a store real-name check can extend use. Neither statement confirms support for every bank’s mobile identity check, or conversion of a tourist eSIM while keeping its number. These are KT-specific examples, not a rule for every carrier.
The Welcome Prepaid page also says that top-ups are restricted to stores and service use is limited while real-name verification is pending.
Show these questions at the carrier’s store
Keep the answers privately. This inquiry sheet does not collect or upload your answers. Do not post passport or Residence Card numbers, phone numbers or verification codes in comments.
Can I open this exact plan without a Korean bank account or Korean credit card? Which identity document do I need? Do any visa or remaining-stay requirements apply to this product?
한국 은행계좌나 한국 신용카드 없이 이 요금제에 가입할 수 있나요? 어떤 신분증이 필요한가요? 이 상품에 체류자격이나 남은 체류기간에 따른 가입 조건이 있나요?
How can I pay or top up without them? Does this store accept my available payment method, and what is the full cost?
한국 은행계좌나 한국 신용카드가 없으면 어떻게 납부하거나 충전하나요? 제가 가진 결제수단을 이 매장에서 사용할 수 있나요? 전체 비용은 얼마인가요?
Can I register this line in my own name using the ID I have now? Does this exact plan support Korean mobile identity verification, beyond receiving ordinary text messages? What additional registration would I need for that?
현재 가진 신분증으로 이 번호를 제 명의로 등록할 수 있나요? 이 요금제는 일반 문자 수신 외에 휴대폰 본인인증도 지원하나요? 이를 이용하려면 어떤 추가 등록이 필요한가요?
I need to use this bank or service: __________. What name spelling, document registration or other steps are required? I will also confirm the service’s own requirements.
이 은행이나 서비스에서 쓰려고 합니다: __________. 영문 이름 표기, 신분증 정보 등록 등 필요한 절차가 있나요? 해당 서비스의 이용 조건도 별도로 확인하겠습니다.
If I first activate with a passport, can I add my Residence Card later and keep the number? Is that possible for this exact product, and must I visit this store again?
여권으로 먼저 개통한 뒤 외국인등록증 정보를 등록해도 번호를 유지할 수 있나요? 이 상품에서 가능한가요? 꼭 이 매장을 다시 방문해야 하나요?
Will this SIM or eSIM work with my exact phone model? What are the activation date, the expiry dates for the plan allowance and any prepaid credit, and the recharge or ID-update deadlines? What would trigger suspension or cancellation of the line?
이 유심 또는 eSIM을 제 휴대폰 모델에서 사용할 수 있나요? 개통일, 기본 제공량과 충전 잔액의 유효기간, 충전이나 신분증 정보 갱신 기한을 각각 알려주세요. 어떤 조건에서 회선이 정지되거나 해지되나요?
Use the answers, not a blanket promise
If the answer is unclear, ask the carrier to identify the product and the remaining step before purchase. This sheet does not establish your eligibility, guarantee activation or replace the bank’s own checks. No plan was purchased or tested for it.
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Visiting for two or three months rather than setting up as a resident? Read the visitor SIM and eSIM comparison. For other arrival tasks, browse the Life in Korea guides.