How Much Mobile Data Do You Need in Korea?

For most trips to Korea, a light user needs about 5GB, a medium user about 10GB, and a heavy user 20GB or more for a week to ten days. The honest rule of thumb is roughly 0.5GB per day if you mostly use maps and messaging, around 1GB per day for normal travel with some video and social, and 2GB or more per day if you stream and post a lot. A foreigner on a passport buys a data eSIM for this; you do not get a Korean phone number on arrival. The estimator and table below size your plan to your trip length and how you actually use your phone.

Last updated: June 2026. This is general travel and connectivity information, not legal or immigration advice; visa, ARC, and banking rules change, so confirm your own case with the official sources linked below.

How much data do you need per day in Korea?

Plan for about 0.5GB per day as a light user, 1GB per day as a medium user, and 2GB or more per day as a heavy user. Multiply that by your trip length and you have your starting estimate. The single biggest variable is video: navigation and chat sip data, while streaming and scrolling video eat it.

Those daily figures come from how much real apps consume per hour. Google Maps navigation uses only about 5 to 10 MB per hour, so a full day of getting around Seoul barely registers. (In Korea most travelers route with Naver Map or Kakao Map rather than Google Maps, since Google’s walking and driving directions are limited here by mapping-data export rules, but the data appetite is similar: a routing app is light.) The data goes elsewhere. Instagram runs around 720 MB per hour and TikTok around 840 MB per hour, Netflix uses about 1GB per hour in standard definition and roughly 3GB per hour in HD, and YouTube sits between those depending on resolution. Music streaming on Spotify is light at well under 150 MB per hour. So your real number depends less on how long you are in Korea and more on whether you watch video on the subway.

What each usage style actually looks like

To place yourself on the scale, match your habits to one of these three travelers rather than guessing at gigabytes. The light traveler navigates with a map app, messages family over KakaoTalk or iMessage, looks things up, and posts the odd photo, with little or no video on cellular; that lands near 0.3 to 0.5GB a day. The medium traveler is the typical case: maps all day, social feeds with autoplay video, a few short clips, some music, photo and story uploads, and the occasional video call home, which works out to roughly 0.8 to 1.2GB a day. The heavy traveler streams music and video on the move, scrolls TikTok or Reels for long stretches, uploads constantly, tethers a laptop, or takes long video calls, and climbs to 2GB a day and well past it.

If you sit between two styles, size up. Running short on data mid-trip in a foreign country is far more annoying than carrying a couple of spare gigabytes.

How much data do you need by trip length?

Take your daily style and multiply by your nights in Korea. The table below does that math and maps the result to a plan size, so you can read across from your trip and usage to a recommendation.

These are practical sizes, not hard ceilings. The 5GB and 10GB plans cover the vast majority of one-week visitors, because Korea has dense free Wi-Fi in cafes, hotels, the subway, and many public spaces, and most heavy video happens on Wi-Fi anyway. Cellular data is for the gaps between Wi-Fi: navigating, messaging, ordering, and posting on the move.

Which plan size should you pick?

Here is the short recommendation most travelers can act on directly:

Notice the last column: every data eSIM is internet only, with no Korean number, ever. That is the right product for visitors. A real Korean 010 number is a separate, later step that only long-stay residents go through, which the next section explains.

Does a data eSIM come with a Korean phone number?

No. A Korea data eSIM gives you internet on your passport, with no Korean number attached, and that is exactly what a visitor needs. You do not get a Korean phone number when you land, regardless of which data plan you buy.

A real Korean number (the 010 line that banks, Toss, and the PASS app accept) requires your physical Alien Registration Card (외국인등록증, ARC) plus a long-stay residence visa. The ARC is issued only to people registering for residence, and it takes roughly two to three weeks at minimum after you arrive; the interim registration-fact certificate (외국인등록사실확인서) is not yet accepted for a mobile contract, so the physical card itself has to be in hand. The alien-registration process and the 90-day rule that decides who registers are set by the Korea Immigration Service on the HiKorea portal. Tourists, business visitors, and visa-waiver travelers do not register for an ARC, so they cannot get a Korean number and do not need one. For sizing data, this is good news: there is nothing to register, no documents to send, and the eSIM activates when you land and power on. For the full picture of the number side, see our guide on how to get a Korean phone number as a foreigner.

What about long-stay residents?

If you are moving to Korea on a work or study visa (F-series, E-series such as E-2 teachers, or long-stay D-series such as D-2 students and D-10 job-seekers), you still start on data. You buy or activate a data plan on arrival, register for your ARC, and once the physical card and a Korean bank account are ready, you convert to a monthly KT postpaid (후불) plan, at which point your 010 number is issued. So even long-term arrivals size data for the first stretch the same way a traveler does, then move to a number later. If you are unsure whether your visa qualifies for a number, ask before you buy rather than assume.

How much data for a one-week trip to Korea, specifically?

For a standard one-week trip with normal use, 10GB is the comfortable choice, and 5GB is enough if you lean on Wi-Fi and mostly use maps and messaging. Only heavy streamers need 20GB for seven days. That holds because the highest-drain activities, full-length video and big downloads, tend to happen back at the hotel on Wi-Fi.

A realistic medium week in Seoul might look like this: a map app open for hours each day costs you only tens of megabytes; a couple of hours of social feeds and short video runs maybe 1 to 1.5GB across the day; music on the move adds a little; a short video call home adds a few hundred megabytes. Add it up and most travelers land near 1GB a day, which is why 10GB clears a week with headroom. Light users who watch their video on Wi-Fi often finish a week under 5GB.

What uses the most data, and how do you make a plan last?

Video is what drains a travel plan, and Wi-Fi is what saves it. Shift streaming, large uploads, and app downloads onto Wi-Fi, and even a modest plan stretches across a long trip. A few habits save the most data in Korea, and they take seconds to set up.

The single best move is to load what you need before you leave the hotel: save your offline map area and the day’s playlists on Wi-Fi so navigation and audio barely touch cellular. Korea then gives you plenty of Wi-Fi to top up on, with free networks in cafes, hotels, malls, and airports, and public Wi-Fi on much of the subway and many buses, so stream and upload there rather than on your plan. On cellular itself, the biggest lever is video quality: turning off autoplay in Instagram, TikTok, and YouTube and capping streaming to standard definition can cut your video data by more than half. The habit that quietly burns the most is tethering, since sharing your eSIM to a laptop for work or to a companion’s phone runs through data fast, so if you plan to tether, size up.

If you do run low mid-trip, you have options. You can lean harder on Wi-Fi for the rest of the stay, buy a second eSIM for the remaining days, or add data to your line. Either way, sizing a little high at the start is cheaper than scrambling later. If you want a step-by-step on getting connected the moment you land, see our Korea eSIM activation guide.

Verify it yourself (official sources)

Data sizing is travel advice, but the number and ARC side touches immigration and banking rules that do change. Check the primary sources before any decision that depends on them. For alien registration, the 90-day rule, and who registers for residence, the Korea Immigration Service runs the HiKorea portal. For who can hold a mobile line and how real-name identity verification works, the Ministry of Science and ICT (MSIT, 과학기술정보통신부) sets the policy.

Frequently asked questions

How much data do I need for a week in Korea?

For a standard one-week trip, 10GB is comfortable for normal use, 5GB is enough if you mostly use maps and messaging and rely on Wi-Fi, and 20GB suits heavy streamers. Korea has dense free Wi-Fi, so most large video and downloads can happen off your cellular plan.

Is 5GB enough for a trip to Korea?

Yes, for light users and shorter trips. 5GB covers roughly ten days of maps, messaging, search, and light social if you watch video on Wi-Fi. If you stream video or scroll a lot on cellular, step up to 10GB or 20GB instead.

Will I burn extra data because Google Maps does not work well in Korea?

No. Most travelers switch to Naver Map or Kakao Map for accurate Korean directions, and a routing app of any kind is light, on the order of 5 to 10 MB per hour. The map is not your data problem; streaming video and social feeds are, so route however you like and just keep video on Wi-Fi.

Do I need a separate eSIM for a layover or a side trip to Japan?

Your Korea data eSIM only works in Korea, so a separate Japan eSIM covers a Tokyo or Osaka stop on the same trip. A short Incheon layover where you stay airside usually needs nothing, since the airport has free Wi-Fi; buy data once you actually clear immigration and need it on the move.

Can two people share one Korea data plan?

Only by tethering, and it is rarely worth it for data-heavy use. One phone holds the eSIM and shares its connection over a hotspot, which drains the plan roughly as fast as two people using it directly and ties both of you to staying close. For a couple or family, two smaller eSIMs usually beat one large shared one.

Does using KakaoTalk, Naver, or Korean delivery apps use a lot of data?

No. KakaoTalk messaging and voice calls, Naver search, translation in Papago, and ordering in delivery or taxi apps are all light, comparable to messaging and web browsing rather than video. The one exception is sending or watching video and photos inside KakaoTalk, which counts the same as any other media.

What happens if I run out of data mid-trip?

You can lean on Wi-Fi for the rest of your stay, buy a second data eSIM for the remaining days, or top up your existing line. Sizing slightly higher at the start is usually cheaper and less stressful than running out abroad, so if you are between two plan sizes, pick the larger one.

How much data do I need if I am moving to Korea long-term?

Size data the same way for your first few weeks, then switch to a monthly plan once you have a number. New long-stay residents start on a data eSIM, register for their ARC, and convert to a KT postpaid plan after the physical card arrives, which is when the 010 number is issued.

Pick the size that fits your trip

Sizing data in Korea comes down to two numbers: your nights here and how much video you watch on the move. Maps and messaging barely count; streaming and posting are what move you up a tier. Match your trip to the table, lean on Korea’s free Wi-Fi for the heavy stuff, and size up if you are on the fence.

For a short visit with light use, a 5GB Korea data eSIM is plenty; for a normal week, the 10GB plan is the safe middle; and for longer stays or heavy streaming, go with 20GB. Each one activates the moment you land, with no Korean number to register and nothing to set up at the airport. Compare the plans on our eSIM shop, and if you are moving to Korea long-term, start on data and add a number later once your ARC comes through.