Getting mobile phone service and home internet set up is one of the first practical steps after arriving in Korea. This guide walks you through the options for both, along with what documents you need and how much to budget. Verified against current 2026 carrier information.
Quick Decision: Prepaid vs Postpaid
If you have not received your Alien Registration Card (ARC) yet, start with a prepaid SIM. Only your passport is required. Once your ARC arrives (typically 2 to 6 weeks after registration), you can switch to a postpaid plan or an MVNO plan for much lower monthly costs.
The Three Major Carriers
Korea has three major mobile network operators, all with nationwide 5G and LTE coverage.
SK Telecom (SKT): Often ranked highest for overall network experience in independent testing.
KT: Strong 5G availability, widely used across Korea.
LG U+: Competitive on speeds, aggressive pricing in some tiers.
Flagship 5G unlimited plans from the big three typically run KRW 69,000 to 100,000 per month. All three support eSIM in 2026.
MVNO: The Budget Option
MVNOs (알뜰폰, altteulpon) are budget carriers that resell the big three networks. Coverage and speeds are identical, but monthly costs are 30 to 60 percent lower. Plans commonly start around KRW 9,900 per month for basic data, ranging up to KRW 40,000 for larger data allowances.
The government-backed comparison site mvnohub.kr is the standard reference for current MVNO plans. Many foreigners settle on an MVNO plan after ARC issuance to keep monthly costs low.
Documents You Need
Prepaid SIM: Passport only. Available at airport arrival counters, convenience stores (CU, GS25), and dedicated dedicated kiosks.
Postpaid plan or MVNO: ARC required. Korean bank account required for monthly auto-debit. Signup possible online, in carrier stores, or at CU and GS25 counters for some MVNOs.
Where to Sign Up
Airport (Incheon or Gimpo): Convenient for prepaid SIM on arrival. Slightly higher prices than in-city options.
Carrier stores: Best for detailed comparisons and English-speaking staff at major hubs like Myeongdong, Gangnam, and Itaewon.
Convenience stores: CU and GS25 sell prepaid SIMs and some MVNO plans.
Online: Most MVNOs allow full online signup once you have an ARC and Korean bank account.
Home Internet Installation
The same three carriers (KT, SK Broadband, LG U+) dominate the home internet market. Monthly costs run roughly KRW 33,000 to 44,000 for standalone 1 Gbps plans, sometimes dropping into the 20,000s with mobile or TV bundling, with 10 Gbps options available at higher tiers.
Installation is typically completed 1 to 3 days after applying. Setup fees are often waived through promotions, or run roughly KRW 30,000 to 70,000 as a one-time charge. Documents required: passport or ARC, proof of residence such as your rental contract, and a Korean phone number.
Important Note About Officetels
Many officetels and apartment complexes include pre-installed internet as part of building services. Ask your landlord or building management before signing up separately. In some cases the internet is included in monthly maintenance fees, saving you the extra contract.
eSIM Options
All three major carriers and most MVNOs support eSIM activation in 2026. For iPhone and modern Android users, eSIM offers instant activation without waiting for a physical SIM to ship. Great for arrival-day setup if you have a compatible phone.
Practical Tips
Start with a 30-day prepaid SIM if your ARC is not ready. Most airport prepaid packages include unlimited data with LTE speeds. Once you have your ARC, compare MVNO plans on mvnohub.kr for the best long-term value. Confirm your building already has internet before contracting separately. Save your carrier login and contract details, as changing plans or canceling requires them.
Frequently Asked Questions
Q: Can I keep my Korean phone number if I change carriers?
Yes. Number portability is standard across all carriers and MVNOs in Korea.
Q: How reliable is Korean internet?
Very reliable. Korea consistently ranks among the top countries for internet speed and stability.
Q: What if my Korean is limited?
Major carrier stores in Myeongdong, Gangnam, and Itaewon typically have English-speaking staff. Online MVNO signup pages often lack English support, so in-person is easier for many foreigners.
Q: Are the numbers on this page guaranteed?
Prices and plans change frequently. Always confirm current pricing with the carrier or on mvnohub.kr before signing.
Looking for a Place in Seoul?
Your rental address is required for both postpaid mobile and home internet contracts. Ziptoss helps foreign residents find verified Seoul rentals with clear listings.
Browse Available Properties on Ziptoss →
Explore Seoul rental map, filter by area, and inquire directly.
Pricing and plan details verified as of 2026. Rates change frequently. Always confirm current pricing directly with carriers before signing.