Korea&YouYour Korean Phone Number, Part 2: Registering Your Permanent Line
What to do once your Residence Card arrives — from carrier registration to your PASS identity certificate
In Part 1, we covered the passport-based prepaid SIM that gets you through your first days in Korea. That number has a short shelf life: it expires when you leave the country (or around 90 days), and it can't be used for Korean identity verification.
This post covers the number that actually runs your life here — the one linked to your bank account, your PASS certificate, and your campus portal.
Quick answer: You need your Residence Card (formerly called the ARC) before you can register a permanent Korean number. Registration happens in person, either at a major carrier store or a cheaper MVNO (budget SIM) shop. Once that line is active, set up the PASS app — Korea's standard mobile identity-verification tool — before you try to open a bank account or use most Korean apps.
Step 1 — Get Your Residence Card First
You can't open a regular postpaid line, or transfer your prepaid number into your own name, until you have it. If you haven't registered yet, that process runs through HiKorea, covered in the previous post — worth doing before anything else on this list.
One easy-to-miss rule: if fewer than 60 days remain on your legal stay, carriers won't let you open a new regular line, so keep this in mind if your visa is close to expiring.
Step 2 — Choose Where to Register
You have two realistic paths, and both require an in-person visit for your very first Korean line:
• Major carrier stores (SKT / KT / LG U+): Higher monthly cost, but the most straightforward experience and the widest store network. Bring your Residence Card, passport, and a Korean bank account or debit card for autopay.
• MVNO / "budget SIM" shops — known in Korean as 알뜰폰 (altteulpon), such as KT M Mobile, U+유모바일, or SK 7mobile: Typically 20–30% cheaper than the major carriers' regular plans, since you're using the same towers under a different brand. Many university-area shops specifically cater to international students, running English-friendly, passport-plus-Residence-Card sign-ups in about 15 minutes.
For MVNOs specifically, staff will ask for your alien registration number, passport number, nationality, and length of stay — have your Residence Card ready before you sit down. If you don't yet have a way to verify your identity online, ask for phone-based verification with an agent instead of the self-service form.
Step 3 — Link a Korean Bank Account
Postpaid plans are billed by autopay, so you'll need a Korean bank account or debit card at signup. If you don't have one yet, most students open the SIM and the bank account in the same week, since each makes the other easier.
The Step Everyone Forgets: Setting Up Your PASS Certificate
Once your permanent number is active, download the PASS app (issued by SKT, KT, or LG U+ — it works across all three networks, including MVNOs). This is Korea's standard mobile identity-verification tool, used for everything from banking logins to government sites.
• Install PASS and register using your new 010 number.
• Enter your name exactly as it's registered with your carrier — usually all capital letters, matching your Residence Card, not a casual English spelling.
• In the app, open the certificate menu and complete the short PIN or biometric setup to issue your PASS Certificate, which many banks and government portals will ask for by name.
Precautions & Tips
• Match your name everywhere. The spacing and spelling on your Residence Card must exactly match what's entered at the telecom counter, or identity verification will silently fail later.
• Passport-based numbers expire. If you're still using your Part 1 prepaid line, remember it's deactivated once you leave Korea, or after around 90 days — plan to switch over once your Residence Card arrives.
• eSIM reissue has a small fee. Most MVNOs charge a small reissue fee (commonly a few thousand KRW) if you move your eSIM to a new phone, so check before switching devices.
The Bottom Line
Once you're holding your Residence Card, head to a carrier or MVNO store to set up your real, verified 010 number, then finish the loop with your PASS certificate. Get this right, and banking, food delivery, and campus admin all quietly stop being a hassle.