Getting a Korean Phone Number

Getting a Korean phone number is a chicken-and-egg problem: you need a number for banking apps and delivery, but the best plans need a residence card you don’t have yet. Here is how to get a Korean phone number as a foreigner, in the right order, and when prepaid beats postpaid.

Short version

On arrival, buy a prepaid plan with just your passport. Once your residence card (ARC) arrives, switch to a monthly postpaid or budget (MVNO) plan. Don’t buy anything expensive on day one.

Prepaid vs postpaid in Korea: the real difference

Korea has three mobile carriers: SK Telecom, KT and LG U+. According to the government’s Korea.net guide to getting mobile service, a passport lets you sign up only for a prepaid plan. A monthly plan needs an ARC, and you might also need a Korean bank account or credit card. Requirements differ by carrier.

In plain terms:

• Prepaid (선불): you pay first, then use. Passport only. Fast, but it is meant for the first weeks.

• Postpaid (후불): a monthly bill, usually auto-debited from a Korean account or card. Needs your ARC.

• MVNO (알뜰폰): budget brands that rent the big three’s networks. Many need an ARC too, so check before you walk in.

Step 1: Get a prepaid plan with your passport

Walk into a carrier store or pick up a SIM at the airport, show your passport, and pick a plan. In the Korea.net example the clerk finishes it in minutes. Choose the cheap one. You will replace it soon.

Jun’s tip: a passport-registered prepaid number may not pass the identity checks that banks and some apps run. Treat it as a bridge for maps, messaging and calls, and don’t be surprised if a verification code fails.

Step 2: Register your ARC, then bank

Most people wait a few weeks for the card. If you haven’t started, read how to get your ARC in Korea. Then, because many postpaid plans bill by auto-debit, read how to open a Korean bank account as a foreigner.

Step 3: Switch to postpaid or an MVNO

Bring your ARC, passport and your account or card details to a store. The Korea.net clerk also warns that the plan you qualify for can depend on your visa type, so ask what your visa allows.

You don’t have to figure out the Korean on your own. The same article lists English-capable help lines, though these are from 2019 and may have changed, so confirm on each carrier’s site: SK Telecom 080-011-6000, KT 02-2190-1180, LG U+ 1544-0010. The Seoul Global Center also lists a mobile-service line at 02-2075-4134.

Jun’s tip: ask for the foreigner-support staff by saying “English, please” at the counter, or book a visit time through the carrier’s English line. A store at a busy hour is the worst place to compare plans.

Which should you pick: prepaid or postpaid?

If you are staying a few weeks, stay on prepaid. It needs only a passport, and you avoid contracts and bank forms. If you are staying a year or more, treat prepaid as a short bridge and plan the switch the day your ARC arrives.

The question that decides it is simple: do you need the number to work for banking, delivery apps and government sites? If yes, you want a line tied to your ARC. If you just need maps and messages, a passport line is fine.

A small habit helps: write down the date your ARC is expected, and book your carrier visit for the same week. That way your bridge plan never quietly rolls over into another expensive top-up.

How to compare plans without being overwhelmed

Prices change often, so I won’t list them here. Compare these instead:

1. Monthly data and what happens when it runs out. Some plans slow down rather than stop.

2. Contract length. A shorter commitment is safer if your visa is short.

3. Payment method. Make sure your foreign credit card or Korean account is accepted.

4. Support language. Cheaper MVNOs often have thinner English support.

5. What happens if you leave. Ask about cancelling when your visa ends.

Checklist before you go to the store

• Passport
• ARC (for postpaid and most MVNO plans)
• Korean bank account or credit card details
• Your phone, unlocked, so the SIM works
• Your current Korean address, if you’ve moved since registering

Common mistakes

Buying a long prepaid plan. You’ll switch within weeks, so top up small.

Assuming your ARC isn’t needed. Without it you’re limited to prepaid.

Skipping the identity step. If an app won’t verify your number, it may be a passport-registered line. Move to an ARC-linked number.

Not asking about your visa. The Korea.net clerk says plan eligibility can differ by visa type, so ask before choosing.

What’s next

Once you have a number, the next problem is getting around. Next post: how to use Naver Map when Google Maps fails you.

Checked against official sources in October 2026. Carrier rules change, so confirm at the store.