This guide explains the most confusing topic for travelers visiting Korea: choosing between SIM cards and eSIM options. It compares major Korean telecom providers and the global eSIM brand Holafly, helping Korea Untold readers make a clear and informed decision while avoiding common travel connectivity issues.
1. 7-Day SIM & eSIM Pricing Comparison
There are clear differences in price, speed, and benefits between Korea’s three major telecom providers (physical SIM) and Holafly eSIM.
2. Pros and Cons of eSIM
3. Key Points Travelers Commonly Get Wrong
① Need for a Local Phone Number
Many Korean apps (such as reservation platforms) require phone number verification using a Korean mobile number.
② Passport Requirement
Physical SIM cards require passport verification, while eSIM can be activated instantly via QR code.
③ Device Compatibility Check
Users must confirm eSIM support by checking device settings or dialing #06# to verify EID availability.
④ Price Differences by Purchase Location
Airport SIM purchases are more expensive, while online pre-orders are usually cheaper.
4. Frequently Asked Questions (FAQ)
How can I check if my smartphone supports eSIM?
Not all smartphones support eSIM, so it is essential to check before purchasing. On iPhone, go to Settings > Cellular. On Android, go to Settings > Connections > SIM Card Manager and look for the "Add eSIM" option. You can also dial *#06#; if an EID number appears, your device supports eSIM.
Will I get a Korean phone number with an eSIM?
No. Most travel eSIMs, including Holafly, are data-only plans and do not provide a Korean phone number. If you need a local number for restaurant reservations, identity verification, or phone calls, it is recommended to purchase a physical SIM from LG U+ or KT with voice service available.
Do I need a passport to buy a SIM card or eSIM?
Yes, a passport is required when purchasing a physical SIM card in Korea due to legal identification requirements at airport or city stores. In contrast, Holafly eSIM can be purchased online and activated instantly without submitting a passport or completing complicated registration procedures.
Does "unlimited data" really mean unlimited speed?
Not always. Unlimited SIM cards from Korean carriers such as LG U+ and KT typically reduce speeds to 5Mbps after 3GB of daily usage. Holafly eSIM, however, offers true unlimited data without speed throttling, making it better for activities such as HD video streaming and heavy internet use.
Is buying a SIM card at the airport the cheapest option?
No. Purchasing a SIM card directly at Incheon Airport is convenient but usually costs about 5,000–10,000 KRW more than buying it in the city. Ordering online in advance and picking it up at the airport can often save around 10%.
Which SIM card is best if I'm staying in Korea for more than 90 days?
Travelers staying for less than 90 days should use a prepaid SIM card that can be activated with only a passport. If you plan to stay for more than 90 days, such as international students or employees, it is generally more economical to obtain an Alien Registration Card (ARC) and sign up for a postpaid mobile plan with additional discounts.
Do I need to remove my current SIM card to use an eSIM?
No. Because an eSIM is built into your phone, you can keep your existing physical SIM card installed while using the eSIM for mobile data in Korea. This allows you to continue receiving calls and text messages on your original phone number while using Korean mobile data.
Does using an eSIM drain the battery faster?
Yes. Using an active eSIM alongside a physical SIM may slightly increase battery consumption compared to using only one SIM. Since travelers often use maps, translation apps, and cameras throughout the day, carrying a 10,000mAh or larger portable power bank is highly recommended.
If you need a Korean phone number and lower cost, LG U+ or KT physical SIM cards are the best choice.
If you prefer convenience and unlimited data without SIM swapping, Holafly eSIM is the most efficient option.Always check device compatibility (EID support) before purchasing.
Not every smartphone supports eSIM technology. Before purchasing an eSIM for your trip, check our eSIM Compatible Devices List (South Korean Samsung & iPhone): Is Your Phone Supported? to verify your device's compatibility, learn how to check for an EID number, and avoid buying an eSIM that won't work with your phone.
Before learning how to save money while shopping in Korea, you may want to check our complete Korea Tax Refund Guide 2026 to understand how foreign travelers can claim tax refunds, meet eligibility requirements, and maximize their shopping savings during their trip.
