Korean phone plans for foreigners, explained

Picking a Korean phone setup is confusing because the advice online mixes up four very different products. Here is the clean version, sorted by length of stay.

Under 1 month: data eSIM

If your phone supports eSIM, buy one online before you land and skip the airport counters entirely. Unlimited-data tourist eSIMs cost roughly 25,000–35,000 KRW for a week. The catch: most are data-only, so you won’t have a Korean 010 number. For tourists this rarely matters — maps, translation and KakaoTalk all run on data.

1–6 months: prepaid USIM

Students on short programs, working-holiday arrivals waiting for their ARC, and long tourists should get a prepaid USIM with a real Korean number. You only need a passport, and you can buy at the airport, convenience stores or carrier shops. A Korean number unlocks the apps that actually run life here: banking, Coupang, Baemin delivery and restaurant waitlists all require SMS verification.

6+ months: postpaid or MVNO

Once you have an Alien Registration Card, postpaid plans open up — and so do the real savings. The big three carriers (SKT, KT, LG U+) charge 39,000–59,000 KRW per month with good English support. Budget MVNOs piggyback on the exact same networks for roughly half the price; foreigner-focused ones like Chingu Mobile and Woori Mobile handle signup in English. Expect to need your ARC and a Korean bank account for auto-payment.

One warning before you sign anything

Postpaid contracts in Korea are tied to your identity, not your number. If you ever leave Korea without formally cancelling a plan, the unpaid balance follows your ARC — and will block any new postpaid signup years later. Cancel in person or through your carrier before departure, and keep the confirmation.

Frequently asked questions