How to stay online in Korea: eSIM, SIM, pocket Wi-Fi, free Wi-Fi and the apps that work best.
Most travelers want one answer: what is best for me? Find your situation in the table.
| Your situation | Best choice |
|---|---|
| Traveling alone with a recent smartphone | eSIM |
| Traveling with 2 or more people | Pocket Wi-Fi or eSIM |
| You need a Korean phone number | A Korean SIM or eSIM with voice/SMS |
| Your phone does not support eSIM | A physical SIM card |
| You do not want to set anything up and your carrierโs roaming is fine | Roaming from your home carrier |
| You use very little data | Free Wi-Fi plus a small data plan |
| You travel outside the big cities, for example to Jeju | A reliable SIM or eSIM |
| You also use a laptop or tablet | Pocket Wi-Fi |
You will often need data right at the airport, for example to:
Donโt wait until you arrive to figure out your internet connection.
Support depends on the model and the country where you bought the phone. Quick checks:
Your phone must be unlocked to use a local SIM or eSIM. A phone locked to your home carrier only accepts that carrierโs SIM cards, so a Korean SIM or eSIM will not work, even if the phone supports eSIM. Ask your carrier whether your phone is unlocked and have it unlocked before you travel, because this can take a few days.
Do not remove your home SIM unless you know you no longer need it. It can stay in the phone for calls and texts from home while the Korean eSIM provides your data.
Internet only: maps, translation, KakaoTalk, WhatsApp, Instagram and web search. No Korean phone number, and you cannot receive Korean SMS.
Data plus a Korean phone number: you can make calls and receive SMS.
Many travel eSIMs are data-only, so read the product page before you buy.
Not every app needs one. KakaoTalk, for example, can be registered with an overseas phone number. Some services may require a Korean number, so check before you rely on it.
Installing the eSIM and using it for mobile data are two separate steps. Menu names differ a little by phone model and software version.
Travel SIM cards are sold at the arrivals hall of Incheon and Gimpo airports, and pre-ordered ones can be collected at airport counters.
If you need a Korean phone number, check that the plan includes voice/SMS.
A pocket Wi-Fi router creates a Wi-Fi network that several devices can share. You rent it, often at the airport, and return it before you leave.
Roaming is the easiest option if you do not want to change any settings: there is nothing to buy or install. Check your carrierโs daily price first, because roaming can be expensive.
| eSIM | Roaming | |
|---|---|---|
| Buy in advance | Yes, before you travel | No, nothing to buy |
| Install | Yes, you install a profile | Almost none |
| Keep your usual number | Yes, on your home SIM | Yes, nothing changes |
| Data in Korea | Yes, data works | Yes, data works |
| Convenience | โ โ โ โ | โ โ โ โ โ |
| Cost | Usually cheaper | Depends on your carrier |
If you do not want to change any settings, roaming is the easiest option.
| Travel style | Roughly |
|---|---|
| Maps and web search | 1โ2 GB per day |
| Social media and photo uploads | 2โ3 GB per day |
| Video streaming | 3 GB or more per day |
| Heavy use | Consider an unlimited plan |
โUnlimitedโ does not always mean full speed. Many plans slow down after a daily limit, and the details differ by product, so read the product page.
If you want to share data with a laptop or another phone, check that the eSIM allows hotspot (tethering). Some travel eSIMs restrict it.
Free Wi-Fi is available at airports, subway and train stations and at certain bus stops. It is fine for light use and as a backup, but it works best as a supplement to mobile data.
Choose the network, open your browser and follow the sign-in page: accept the terms and press connect.
For SEOUL_Secure, the Seoul Metropolitan Government gives the ID โseoulโ and the password โseoulโ. On Android choose PEAP and โDo not validateโ for the CA certificate; on iPhone trust the certificate when asked.
Some networks run by individual carriers ask for a Korean phone number. If a hotspot asks for one, switch to another network.
Turn off automatic connection to open networks, and use a VPN if you must use sensitive services.
Free Public Wi-Fi in Korea: Where and How to ConnectGoogle Maps is useful for finding places, but navigation in Korea can be limited.
Install NAVER Map before your trip. KakaoMap is also a useful alternative.
| Purpose | App | Importance |
|---|---|---|
| Maps and navigation | NAVER Map | โ โ โ |
| Translation | Papago | โ โ โ |
| Taxi | Kakao T / k.ride | โ โ โ |
| Purpose | App | Importance |
|---|---|---|
| Map alternative | KakaoMap | โ โ |
| Messenger | KakaoTalk | โ โ |
| Subway | Subway Korea or Kakao Metro | โ โ |
| Trains | KORAIL | โ โ |
| Emergency alerts | Emergency Ready | โ |
| Tourist information | Visit Korea | โ |
Save your hotelโs Korean address, not just its name.
Useful AppsTake screenshots of important information before you leave the airport.
Internet is useless when your phone battery is dead.
Korea uses 220 V and plugs with two round pins. See Electricity on Before You Go.
Before You GoTell the two problems apart: if mobile data works but Wi-Fi does not, it is a Wi-Fi problem; if neither works, check your eSIM or SIM.
eSIM, SIM cards and Pocket Wi-Fi in KoreaCan I...? Phone & Internet
Compare eSIMs, airport SIM cards and pocket Wi-Fi for South Korea, plus the navigation apps that actually work best here.
Read the guideHow Koreaโs government-backed free public Wi-Fi works, how to find hotspots, the network names to look for in Seoul, safety tips and when an eSIM is still the better choice.
Read the guide