PREPAID · WALK-IN READY

Just your passport. That’s all you need to start.

  • ✓Passport — that’s it
  • ×No ARC required
  • ✓5G — activated today
See Welcome Plans 📞 1644-4570

Passport

HOLDER / NAME
Republic of Korea entry — OK

KT Prepaid USIM

Ready to activate
ACTIVATED ✓
PLANS · 30-DAY CYCLE

Choose your Welcome plan.

Three flat-rate prepaid plans. Same activation, same network — different data caps.

Welcome 3
Daily use
₩45,000 / 30 days
  • Data3 GB · 5G
  • After cap3 Mbps
  • Voice200 min
  • SMS200
Best Value
Welcome 5
For most travelers
₩55,000 / 30 days
  • Data5 GB · 5G
  • After cap5 Mbps
  • Voice200 min
  • SMS200
Welcome 1
Light use
₩35,000 / 30 days
  • Data1 GB · 5G
  • After cap1 Mbps
  • Voice200 min
  • SMS200

USIM card ₩7,700 (one-time, separate)

AFTER-CAP SPEED GUIDE

What you can do at each speed.

Even after your high-speed data is used up, your line stays connected at the after-cap speed — never disconnected.

Speed
Video
Music
Web · SNS
⚡ Fast
5Mbps
720p HD ✓
Smooth streaming
Fast loading
OK
3Mbps
480p SD
Smooth
OK
🐢 Slow
1Mbps
240p only
Buffering
Text only
★ MEGA TELECOM EXCLUSIVE

Switch to postpaid later —
your last top-up becomes credit.

Start prepaid with your passport. Get your ARC in about 3–4 weeks. Convert with the same number — your last prepaid top-up is registered as credit on your KT account, and your monthly bills come out of that credit before your bank is charged.

01

Activate prepaid

Walk in with your passport. Pick a Welcome plan. Line active in minutes.

→
02

Get your ARC

Continue using KT while you wait for your Alien Registration Card — usually 3–4 weeks.

→
03

Convert to postpaid

Same number, same line. Your last top-up becomes credit toward your postpaid bills.

Example
Welcome 5 — last top-up ₩55,000
₩55,000 credit
Available at all 4 Mega Telecom stores: Itaewon · Sindang · Dongbu-Ichon · Sookmyung Univ.
BEFORE YOU VISIT

What you'll need

Three things. Bring them and you walk out with a working line.

1

Passport

That's the only ID you need. No ARC, no Korean bank account, no address proof.

  • Must be the original, not a copy
  • ARC-less prepaid lines are valid for 90 days
2

Unlocked phone with a SIM slot

Prepaid is physical USIM only — there is no eSIM option.

  • Carrier-locked phones won't accept our USIM
  • eSIM-only iPhones (US models) won't work
  • No phone yet? Buy one in store at the same time
3

₩7,700 USIM fee + plan fee

Paid once at signup, on the spot. Cash or card both fine.

  • USIM card: ₩7,700 (one-time)
  • Plan fee: charged up front for the period you choose
  • No monthly bill afterwards — you top up when you want

HOW MANY LINES CAN I GET?

Check your visa.

Line limits and phone-installment limits are set by your visa type, not by us. Pick yours to see what applies.

Ask us about your case
RECHARGE METHODS

Three easy ways to top up.

Reload your balance from anywhere — by phone, online, or at any KT store.

📞

ARS (by phone)

1500Free from KT lines
010-7201-1500Paid call from any phone
Available 24/7

💻

Online · kt.com

kt.comCredit card · Prepaid card
Check balance anytime
Recharge in seconds

🏪

Visit KT store

3,000+ storesNationwide
Cash · Card · Bank transfer
Staff assistance

VALIDITY PERIOD

Bigger top-ups last longer.

Each top-up extends your line’s active period. Larger amounts get exponentially more time.

Charge amount
Validity
Days
₩5,000
30days
₩10,000
60days
₩20,000
120days
₩30,000–35,000
180days
₩40,000–45,000
240days
₩50,000–55,000
365days
FAQ

Common questions, answered.

Everything you might want to confirm before walking in.

Do I really need an ARC to sign up?
No — your passport is enough for a prepaid line. ARC-less lines are valid for 90 days only. If you stay longer and get your ARC, you can keep the same number and switch to postpaid (see the credit benefit above).
Can I use eSIM instead of a physical SIM?
No, prepaid is physical USIM only. Check your phone has a SIM slot — some US iPhones are sold eSIM-only and won’t accept our prepaid USIM.
Does this number work for app verification (Toss, Coupang, banking)?
Yes — it is a regular KT 010 number registered in your name, so SMS verification codes work the same as any Korean line (Coupang, delivery apps, KakaoTalk, most sign-ups).

One caveat: services that verify your Korean resident / alien registration number — banks, Toss, and other financial apps — also need your ARC. The line is not the blocker there; the ARC is. Once you have your ARC you can switch this same number to postpaid.
What happens to my prepaid top-up when I switch to postpaid?
A Mega Telecom exclusive: when you convert your prepaid line to a KT postpaid plan using the same number, your last prepaid top-up is registered as credit on your KT account. Your monthly bills are deducted from that credit first, and nothing is charged to your bank account until it is used up. Only the last charge carries over, not every month you were on prepaid. Available at all 4 of our stores — just mention it at signup.
What happens when I leave Korea?
Your line auto-suspends when validity expires. When you return, just visit any of our stores with your passport to reactivate the same number.
What if my balance runs out or validity expires?
Service tapers in stages:
  • Day 0: Outgoing calls and texts stop
  • Day 14: All service (incoming included) stops
  • Day 44: Line terminated. Number returned to KT pool.
Remaining balance is not refunded. Top up before Day 44 to keep the same number.
What are the rates if I exceed my plan?
Beyond your monthly quota (VAT included):
  • Voice: ₩1.98 / second
  • Video call: ₩3.3 / second
  • SMS: ₩22 each
  • LMS (long message): ₩33 each
  • MMS (with image): ₩220 each
Data has no overage charge — you continue at the after-cap speed instead.

More questions → Full FAQ

Come in with your passport —
leave with a working line.

Multilingual staff at our Itaewon Global Store. All 4 locations support foreign customers.

📍 Itaewon Station 📍 Sindang 📍 Dongbu-Ichon 📍 Sookmyung Univ. Station
Free Consultation View store locations 📞 02-790-4577 💬 WhatsApp Chat
📞 💬