South Korea stands out globally for its cutting-edge technology, robust digital infrastructure, and lightning-fast internet speeds. Whether you're visiting South Korea for a short vacation, working remotely, or staying for a long period, staying connected to the internet is essential. Fortunately, acquiring a SIM card and internet access is straightforward. Here's an expanded, detailed guide to help you navigate the process.

Types of SIM Cards Available in South Korea

When planning your stay in South Korea, you’ll need to choose between prepaid and postpaid SIM cards. Understanding the differences will help you make an informed decision.

Prepaid SIM Cards

These are the most popular options for tourists and short-term visitors. They are convenient, flexible, and typically don’t require a long-term commitment. Prepaid SIM cards are generally sold with preset data, calls, and text allowances. Once your data or validity expires, you can simply purchase a new plan or recharge.

Best for: Tourists, short-term visitors, and those who do not want to commit to a long-term contract.

Activation: Instant or within a few hours, with no need for credit checks or documentation other than your passport.

Postpaid SIM Cards

These plans are suitable for long-term residents or people who are staying in South Korea for several months or more. They require a contract, and you will pay a monthly fee. These plans often offer more comprehensive data, voice, and text options.

Best for: Expatriates, long-term visitors, or anyone planning to stay for extended periods.

Activation: Requires registration, proof of address, a South Korean bank account (for billing purposes), and often a credit check.

Choosing the Right SIM Type

Most travelers opt for prepaid SIM cards since they’re quick, hassle-free, and perfect for short stays. However, if you’re planning to stay long-term, postpaid options might give you more flexibility and better data allowances.

Popular Mobile Carriers in South Korea

South Korea has one of the most advanced telecommunications infrastructures in the world, with widespread 5G availability and high-speed mobile networks. The three major mobile carriers—SK Telecom, KT (Olleh), and LG U+—dominate the market, each offering competitive plans and extensive coverage.

1. SK Telecom (SKT)

SK Telecom (SKT), South Korea’s largest and most established mobile carrier, offers nationwide coverage, including rural areas, and industry-leading 5G speeds. It is known for providing some of the fastest 5G and LTE speeds globally, making it a top choice for high-speed connectivity. SKT also offers strong international roaming options, ensuring seamless service for travelers. With a wide range of plans, from budget-friendly prepaid options to premium unlimited data packages, it caters to various user needs. Additionally, SKT subscribers enjoy exclusive benefits through T Membership, which provides discounts on shopping, dining, and entertainment.

2. KT (Olleh)

KT (formerly Korea Telecom) is South Korea’s oldest telecommunications provider, known for its excellent reliability and competitive pricing. It offers extensive 5G and LTE coverage across the country, including underground subway stations and remote areas. KT is also recognized for its affordable pricing, making it a great option for both postpaid and prepaid users. Customers can benefit from strong home internet and mobile bundle discounts, allowing them to save by combining KT mobile plans with home broadband and IPTV services. Additionally, KT has partnerships with global telecom companies, ensuring convenient international roaming services for travelers.

3. LG U+

LG U+ may be the smallest of South Korea’s three major carriers, but it remains a strong competitor, especially in major cities. It is known for its strong urban network, performing exceptionally well in Seoul, Busan, and other metropolitan areas, though its rural coverage is slightly weaker than SKT or KT. LG U+ stands out with competitive data plans, offering some of the most data-heavy options, making it a top choice for heavy internet users and streamers. It also provides affordable SIM-only options, ideal for short-term visitors or those who prefer prepaid plans without contracts. Additionally, LG U+ offers exclusive gaming and entertainment perks, thanks to partnerships with cloud gaming services and media streaming platforms.

Choosing the Best Carrier for You

1. For best overall coverage and speed → SK Telecom
2. For affordability and reliability → KT (Olleh)
3. For urban users and entertainment perks → LG U+

Where to Buy a SIM Card in South Korea

You can buy a SIM card in South Korea from several locations. Whether you arrive at the airport or are already in the city, there are multiple options available:

Airport Kiosks

Incheon International Airport (ICN), Gimpo International Airport (GMP), and Busan’s Gimhae Airport (PUS) are major entry points where you can find SIM card kiosks as soon as you land. These kiosks are usually open 24/7 and staffed with English-speaking employees to help you choose the best plan.

• Advantages: Convenience of getting a SIM card as soon as you land. Some airports even offer free Wi-Fi access if you’re waiting for your SIM card activation.
• Disadvantages: Prices can be slightly higher at airport kiosks compared to other places.

Convenience Stores

South Korea’s convenience stores like GS25, CU, and 7-Eleven are ubiquitous, and many of them sell SIM cards. These stores are open round-the-clock, so you can grab a SIM card at any time.

• Advantages: Easy to find, available even late at night or early morning, and often provide instant SIM card activation.
• Disadvantages: Limited plan options compared to dedicated carrier stores.

Mobile Carrier Stores

The main South Korean mobile carriers—SK Telecom, KT (Olleh), and LG U+—have stores across the country. They offer both prepaid and postpaid options, and you can get assistance with setting up the SIM card if needed.

• Advantages: Access to the most up-to-date plans and customer service.
• Disadvantages: The staff might not speak English, so it may be harder for non-Korean speakers to navigate the options.

Online

You can also purchase SIM cards online, either from the mobile carriers' websites or third-party retailers like Klook, KKday, and Sim Card.co.kr.

• Advantages: Order before arriving in South Korea for convenience, with options to have the SIM card delivered to your hotel or available for pickup at the airport.
• Disadvantages: Might not be as flexible as buying in person, especially if you want to ask questions about the plans.

Required Documents for Purchasing a SIM Card

To purchase a SIM card in South Korea, you’ll need to provide the following documents:

1. Passport: As a foreigner, you’ll need to show a valid passport as identification.
2. Visa: For longer stays, you may need to provide your South Korea visa details. Some carriers may request a copy of your visa, especially if you're purchasing a postpaid SIM card.
3. Local Address: If you’re going for a postpaid plan or some prepaid options, the mobile provider might ask for your South Korean address (e.g., hotel address or accommodation details).
4. Payment Method: If you opt for a postpaid plan, you’ll need to provide a South Korean bank account or a local credit card.

Choosing the Right Mobile Plan

When selecting a SIM card, several factors influence your decision. You’ll need to consider your data usage, calling needs, and the length of your stay:

1. Data – South Korea offers ultra-fast 4G and 5G networks. Prepaid plans range from 1GB to unlimited data, while postpaid plans often include extras like data rollover or streaming services.
2. Calls & Texts – Prepaid SIMs usually include unlimited local calls and limited international minutes. Postpaid plans often have unlimited domestic calls, but international calls may cost extra.
3. Validity Period – Prepaid SIMs typically last 30 days, so choose a plan that matches your stay duration.
4. Data Speed & Network Coverage – SK Telecom, KT, and LG U+ provide excellent nationwide coverage, with both 4G and 5G options depending on your device and plan.

Activating Your SIM Card

Once you purchase your SIM card, activation is generally straightforward:

• Insert the SIM card into your phone.
• Follow the instructions provided with your SIM card. Activation can happen automatically, or you may need to follow a few steps, like restarting your phone or setting up network settings.
• Internet Setup: If necessary, your mobile carrier may provide detailed settings for your phone’s internet configuration (APN settings).
• Customer Support: If you encounter issues, you can visit any mobile carrier store, and staff will assist with troubleshooting.

Using the Internet in South Korea

South Korea is a tech-savvy nation with an abundance of public Wi-Fi spots. You'll find reliable Wi-Fi networks in many public places, cafes, and even parks. Here’s where you can access the internet:

1. Public Wi-Fi: Many public areas in South Korea, like train stations, subways, and shopping malls, offer free Wi-Fi.
2. Cafes and Restaurants: Most cafes, especially chain ones like Starbucks, provide free Wi-Fi to customers.
3. Hotels and Accommodations: Almost all hotels, guesthouses, and hostels in South Korea offer free Wi-Fi to guests. Be sure to check the connection speed and reliability before booking.
4. Renting a Pocket Wi-Fi Device:If you prefer not to use a SIM card or want to connect multiple devices, you can rent a portable Wi-Fi device (also known as pocket Wi-Fi). These devices provide internet access wherever you go, with a data plan included. They are widely available at airports, mobile carrier stores, and online booking services.

If you need more reliable internet on the go, consider using your SIM card for mobile data or renting a pocket Wi-Fi device.

Things to Keep in Mind

• Unlocked Phones: Ensure your phone is unlocked and compatible with South Korean networks, which operate on GSM and LTE bands.
• Data Limits: Check the data limit of your plan to avoid overage charges. South Korea is known for fast data speeds, but you may be surprised by how quickly you can go through data, especially with apps, videos, and social media.
• Language Barrier: While many South Koreans speak basic English, not everyone at mobile carrier stores will. Be prepared to use translation apps or rely on English-speaking staff at major airports or online support.

Frequently Asked Questions

Can foreigners buy a SIM card in South Korea?

Yes! Foreigners can easily purchase prepaid or postpaid SIM cards from major carriers (SK Telecom, KT, LG U+) and MVNOs. Most airports, convenience stores, and carrier stores sell SIM cards, but you’ll need your passport and sometimes an Alien Registration Card (ARC) for postpaid plans.

Which carrier has the best coverage in South Korea?

SK Telecom (SKT) offers the widest coverage, including rural areas and islands. However, KT and LG U+ also provide strong coverage, especially in cities. If you’re staying in Seoul or Busan, all three carriers will work well.

Is 5G available nationwide?

Yes, 5G is widely available in South Korea, especially in cities and major towns. SK Telecom and KT offer the most extensive 5G coverage, while LG U+ is strong in urban areas. However, some rural regions may still rely on LTE (4G).

What’s the best mobile plan for tourists?

For short-term visitors, prepaid SIM cards or eSIMs from KT, SK Telecom, or MVNOs (like Chingu Mobile) are the best options. Plans typically include unlimited data for a set number of days (e.g., 5, 10, or 30 days).

Can I use my foreign phone in South Korea?

Yes, if your phone is unlocked and supports South Korea’s network bands (LTE and 5G). Most modern smartphones work without issues, but it’s best to check compatibility before traveling.

Disclaimer: Although this information was last updated in February 2025, we recommend verifying with the appropriate agencies, embassies, and airlines to ensure complete accuracy regarding your travel plans.