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Compare prepaid SIM cards for South Korea

Reduce your roaming rates by using a local SIM card.


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Editor's choice: SimCorner

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If you’re planning a trip to South Korea, a top tip for keeping down costs is to switch to a local SIM card. Take advantage of better tariffs, plans and deals to dramatically reduce your roaming rates while traveling abroad. You can get 1GB of data from South Korea’s top telco provider for about KRW16,500 (US$15.25). So, whether you’re a short- or long-term traveler, you can save money by comparing your SIM card options.

Compare international SIM cards

Data indicated here is updated regularly
Name Product Number of countries Data range Shipment time
1-12 business days
SimCorner's prepaid SIM cards offer local call, text and data rates in dozens of countries around the world. Choose from a range of data packages, including unlimited data in the USA.
Flexiroam X
3-7 business days
Attach the Flexiroam X ultra-thin microchip sticker to your current SIM card to access data roaming in over 140 countries.
Up to 10GB
1- 5 working days

Compare up to 4 providers

Prices last updated 28 Aug 2017

Telco providers in South Korea

There are three main telco providers in South Korea: SK Telecom, kt olleh and LG U+, which doesn’t provide prepaid SIM cards, so we’ll just focus on the other two providers. Both locals and travelers use SIM cards from the networks, and they can be trusted no matter the plan you choose. According to OpenSignal’s coverage map, South Korea has a great signal all around the country. They offer 3G and 4G/LTE services, and prepaid SIM cards can be picked up from official retailers or approved resellers. Credit can be purchased from almost anywhere. The most popular SIM card in Korean airports is the Korea SIM blue, which can be found at stores like CVS or 7-Eleven.

About South Korea’s operators

It can be quite difficult to set up a prepaid SIM card in South Korea, so we advise you to go to one of the official stores to register the SIM card there and ask the shop assistant to set up and register the number for you. You will need your passport as proof of ID. Be aware that it can take up to three working days for the SIM card to be approved and activated. Below, we have highlighted both providers and exactly what they can offer you during your visit to South Korea.

SK Telecom

SK Telecom is the largest provider in South Korea. It offers services on the 3G and 4G/LTE platforms, and the signal is good. Prepaid SIM cards can be purchased from official stores or approved resellers and credit can also be picked up from the same retailers, or online by using your credit card. Prepaid SIM cards are available which are specifically aimed at travelers, and there are often deals and promotions for short-term plans.

The best place to purchase their SIM cards are at the service center at Incheon International Airport. You’ll find the service center in the arrivals hall and it’s open between 8 a.m. and 6 p.m. The staff there are very helpful and will be able to register the SIM card for you in super-quick time.

SK Telecom also has a short-term smartphone and router rental service for foreigners. You can pick up good two-week, one-month and three-month device rental deals from the official store. Check stores at time of purchase for the latest offers.

SK Telecom’s APN:, website:

kt olleh (Korea Telecom)

kt olleh is run by Korea Telecom and is the second largest provider in the country. It has good coverage and offers customers 3G and 4G/LTE services, each having a different prepaid SIM card. kt olleh prepaid SIM cards are cheaper than SK Telecom and offer better options. The signal and speeds are also better .

There are many English-speaking “Global Stores” dotted round the country, and they can also be found at airports and key areas in the main towns and cities. Prepaid SIM cards can be purchased from official stores or approved resellers; credit can also be picked up from the same locations. Handset rentals are available for tourists on short-term rentals.

In addition, there are Wi-Fi hotspots all around the country, and the service has recently been voted the best in the country. Wi-Fi vouchers can be picked up from almost any retailer in South Korea.

Korea Telecom’s prepaid SIM card is called “olleh”, hence kt olleh, or as it’s known locally: “선불”. kt olleh also sells data-only prepaid SIM cards on “unrestricted” plans for set amount of times:

Valid for 5 daysKRW27,500
Valid for 10 daysKRW38,500
Valid for 30 daysKRW71,500

kt olleh’s APN:, website:

Some top tips from staff:

  • The official language is Korean, but people learn English from a young age and it is spoken widely.
  • Locals call a SIM card a “SIM Kaa” or “SIM”.
  • Ask the sellers to set up the SIM for you, because they will know how to do it. If not, follow the instructions we have highlighted above or go to the official operator website to seek advice.
  • We advise you to purchase your SIM cards from official stores to get the best assistance.
  • Get to the shops early to avoid the crowds.

TripAdvisor tips for the best SIM cards and where to buy them

While it’s best known for reviews, booking hotels, flights and holidays, TripAdvisor also has many user comments that can help guide you through what SIM cards have been tried and tested in South Korea.

Here are two top tips from TripAdvisor users:

“Now you can buy SIM cards in the first arrival floor in Incheon Airport. There are 3 phone shops that are opened for 24 hours, so you can buy the SIM card which is called KT M mobile anytime. If you cannot insert the card, they have staff over there, so don’t worry and have a good trip!”

“I got the Olleh KT sim card (data only) for KRW34,500 for 10 days. They also have KRW24,500 for 5 days. But that is a discounted price if you purchase it via the Seoul Pass website. Unlike other prepaid SIM cards, this one offer unlimited 4G data”

Pros and cons of South Korea’s top telco providers

The network requires you to have a SIM-unlocked, GSM-compatible phone. To double check you have this phone, contact your provider before you set off on your travels.


  • Good value for money
  • Prepaid credit when required
  • No in-store contract needed
  • Could be compatible with your current phone


  • No phone devices offered with the SIM card packages
  • Can only be used on SIM-unlocked GSM phones
  • Complicated rules and regulations make buying a SIM card difficult

Frequently asked questions about finding the best SIM card

Switch to a cell phone plan with international calling

Name Product Data Minutes Texts Can I bring my own phone? Cell phone plans starting at:
Starting at 2 GB
Get unlimited data, calls and text or a customized plan on a 5G network. Eligible plans come with Hulu, Amazon Prime or Tidal subscriptions.
Starting at 2 GB
30-day phone plans that allow you to cancel your service at anytime. Choose from five different talk, text and data options with the choice to add international calling for $10/month.
Starting at 500 MB
Starting at 200 minutes
Starting at 500 texts
Bring your own phone for a free plan with 500MB of data, 200 minutes and 500 texts per month using Sprint's CDMA Network. Prepaid plans with more data, talk and text start at $9.99/month.
NET10 Wireless
Starting at 1 GB
30-day plans with unlimited talk and text and the option to choose how much data is right for you. Add-on rollover data is available starting at $5/500MB.
Straight Talk Wireless
Starting at 3 GB
Choose from several different plan options with no contracts, no fees and coverage on the same networks as AT&T, Sprint, T-Mobile and Verizon.

Compare up to 4 providers

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4 Responses

    Default Gravatar
    SarahNovember 27, 2017

    What’s the best option for a six-month stay in Korea (only really need the data, no voice)?
    Thank you^^

      Avatarfinder Customer Care
      HaroldNovember 27, 2017Staff

      Hi Sarah,

      Thank you for your inquiry.

      While we cannot recommend what is best for you, you can compare the prepaid SIM plans offered by South Korea’s operators: SK Telecom, kt olleh to see which plan suits your needs and can give you the best value for your money.

      I hope this information has helped.


    Default Gravatar
    FrankSeptember 19, 2017

    Going to Vietnam and China also what are my options

      Avatarfinder Customer Care
      MariaSeptember 19, 2017Staff

      Hey Frank,

      Thank you for reaching out to us.

      You may check out this page on Prepaid Sim Cards in China.

      Unfortunately, we are yet to have a page for prepaid sim cards in Vietnam.

      Rest assured, we’ll take note of this to possibly have a page for it in the future.

      I hope this helps.


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