Mobile Phone Plans in Korea Compared (2026): SKT vs KT vs LG U+ vs MVNOs

As of August 2026, comparing mobile phone plans in Korea has never been more confusing — or more important. Under the government’s push to cut household telecom costs, LG U+ rolled out a unified plan lineup on 1 June, followed by SK Telecom on 1 July, both scrapping the old 5G-versus-LTE split entirely. Between the three major carriers, the roughly 700 separate plans on the books have been consolidated down to about 200. In effect, the generational 5G/LTE divide that had defined Korean mobile plans for three decades is gone. The catch: because plan names and structures were overhauled wholesale, anything you read in an article or online forum from even a few months ago is now likely wrong.

This guide isn’t about which carrier has the biggest name — it’s an honest, four-way mobile phone plan comparison of SKT, KT, LG U+, and MVNOs (budget carriers that resell the Big 3’s networks) based on one question: what will you actually pay, right now, in August 2026? The right answer depends entirely on your usage — whether you’re a heavy user who streams video and scrolls social media all day, or a light user who mainly needs calls and texts. So the real point of this mobile phone plan comparison isn’t finding “carrier #1”; it’s finding the plan that fits how you actually use your phone.

2026 has also been a year of real upheaval in the market. Ansim Data (formerly the LTE Ansim Option) — a “worry-free data” feature that throttles rather than cuts you off once you hit your cap — has effectively rolled out to nearly every subscriber. Meanwhile, SK Telecom is still dealing with the fallout from the USIM data breach it suffered in April 2025: the aftershocks carried into the first half of 2026, and SKT’s subscriber share fell below 40% for the first time since the company was founded. On top of that, MVNOs are under pressure of their own, as the Big 3’s expanding lineup of cheap plans dilutes the “cheap” advantage that used to be their main selling point. Below, we’ll work through the summary comparison table, a carrier-by-carrier deep dive, data-cost-per-gigabyte benchmarks, a full price comparison, recommendations by user type, practical tips, and an FAQ.

1. Executive Summary: Mobile Phone Plans in Korea at a Glance (2026)

For readers short on time, here’s the entire four-way matchup between SKT, KT, LG U+, and MVNOs in a single table.

📊 The Complete August 2026 Mobile Phone Plan Comparison Table

The row that deserves the most caution here is “cheapest fully unlimited plan.” All three carriers use the word “unlimited,” but LG U+‘s cheapest plan isn’t full-speed data at all — it’s QoS-throttled unlimited that drops to 400Kbps once you use up the allotment, and the MVNO figure of roughly KRW 7,000 for “full” unlimited is a real-world price after six months of promotional cashback, not the plan’s official listed rate. Before you trust any mobile phone plan comparison, including this one, dig into what “unlimited” actually means on that specific plan — that’s the only way to avoid an unpleasant surprise.

2. A Deep Dive Into Each Carrier’s Core Plans

📶 1) SK Telecom (SKT) — Unified Plans That Erase the Generational Split: “Best” and “Lite”

• Unified plans officially launched on 1 July 2026: SKT became the second of the Big 3 to merge its 5G and LTE lineups, reorganizing everything into two families — five “Best” plans and eleven “Lite” plans. It’s a simple two-track structure: go with Best (KRW 89,000–129,000, ~$66–$96) if you want fully unlimited data, or Lite (KRW 39,000–79,000, ~$29–$59) if your data use is more predictable.
• Tethering data is finely graded by price tier: shared/hotspot data on the Best plans scales from 60GB (Best89) up to 140GB (BestMax), which works well if you want fully unlimited data but still want to dial in exactly how much tethering allowance you’re paying for.
• The Lite lineup spans a wide range: with eleven separate tiers running from Lite79 (250GB, throttled to 5Mbps after that) down to Lite39 (6GB, throttled to 400Kbps), there’s real granularity — even within just the Lite59 bracket (five plans priced KRW 59,000–68,000, ~$44–$50) you can choose anywhere from 24GB to 99GB.
• Automatic age-based perks: subscribers 34 and under get +20GB of extra tethering data on Best plans, and extra data on Lite plans plus a 50% monthly discount on one of coffee, movies, or roaming — automatically, with no separate application. Those 65 and older get more data and calling minutes on Lite45 and Lite39 specifically, and their throttle speed after the cap is raised from 400Kbps to 1Mbps.
• The lingering shadow of the 2025 USIM breach: after the government formally ruled SK Telecom responsible for the April 2025 USIM data breach — which affected roughly 23.24 million subscribers — the company ran a roughly 10-day penalty-free cancellation window in the first half of 2026. Around 166,000 subscribers left during that window alone. The fallout pushed SKT’s subscriber share below 40% for the first time since the company was founded in 1984, though it clawed back some ground in Q1 2026.

📡 2) KT — Same Brand Names, Stronger Auto-Applied Age Perks

• Plan overhaul on 1 July 2026: rather than launching a brand-new unified brand the way SKT and LG U+ did, KT kept its existing “Choice/Unlimited” family names and instead rolled Ansim Data out across the board while layering in automatic, age-based perks. That said, coverage is inconsistent — some outlets list “Choice Special/Basic,” others “Choice Double/Unlimited” — so treat the exact current plan names as unconfirmed until you check KT’s official site.
• The “-Deom” auto-perk system: since July 2026, KT has run a set of age-tiered bonuses it calls SchoolDeom (18 and under), YDeom (19–34), 65+Deom (65–74), and 75+Deom (75 and up) — “deom” (덤) simply means “a little extra” in Korean. No separate sign-up is needed: depending on your age bracket, you automatically get multiplied data allowances and added safety features layered onto whatever plan you’re already on.
• YOGO, the online-only brand, is a strong option for SIM-free users: YOGO is a budget lineup aimed at people running an unlocked phone with no contract, and as of 5 January 2026, the data allowance on “YOGO 30” was bumped up from 5GB to 8GB. Bundling YOGO with home internet also knocks an extra KRW 5,500 (~$4) off your internet bill each month — a nice bonus for value-focused users.
• The mid-tier data plans step up from 30GB to 110GB: starting around KRW 37,000 (~$27) a month, KT’s tiered plans come in enough gradations to suit people who need generous data but don’t need full unlimited.
• Its market share has edged down slightly: KT briefly benefited from SKT’s 2025 breach, holding its share steady for a time, but reports show KT’s own share slipping a bit in 2026 (comparing March 2026 against December 2025).

🔵 3) LG U+ — First of the Big 3 to Unify Plans, and the Simplest Lineup

• First to unify, on 1 June 2026: LG U+ collapsed what had been 53 separate plans down to 18, reorganized into “Plus Plan” (four unlimited tiers) and “Data Plan” (a larger set of tiered options). That makes it the first of the Big 3 to scrap the 5G/LTE generational split.
• Even the cheapest plan is technically “unlimited”: headlines touted “unlimited data for KRW 28,000 a month,” but what that actually means is that even the entry-level Data Plan 300MB (KRW 28,000, ~$21) keeps working after you burn through the allowance — just throttled down to 400Kbps. It is not full-speed unlimited, and that distinction matters.
• Old brand names map onto new ones: the former “5G Signature” is now Plus Plan 130, “5G Premier Super” is now Plus Plan 115, and “5G Premier Plus” is now Plus Plan 105. For existing subscribers, in most cases it’s purely a rename — but it’s an easy thing to mistake for your old plan being discontinued.
• The most flexible bundle discount of the three: if you’re on an MVNO plan that runs on the LG U+ network, you can apply for a bundle discount when you sign up for home internet regardless of which carrier or plan you’re actually on. That’s a clear point of difference versus SKT and KT, and worth noting if your household runs MVNO mobile alongside home internet.
• U+ PASS (유플투쁠) loyalty program: this covers 52 different perks across food and drink, shopping, culture, and leisure. VVIP/VIP-tier members can claim a monthly Starbucks Americano, a Naver Premium membership, 1GB of extra data, and more.

🟢 4) MVNOs — Unbeatably Cheap, But Not Without Traps

• Around 60 providers resell the Big 3’s networks wholesale: the market includes carrier-affiliated brands (SK Telink/Seven Mobile, KT M Mobile, LG HelloMobile/Mediaslog) alongside smaller independents like Freet, iZmobile, and Smartel — roughly 60 competitors in all. As of January 2026, KT M Mobile became the first MVNO to pass 1.9 million subscribers, meaning roughly one in five MVNO users in Korea is on KT M Mobile.
• “Zero-won” plans aren’t actually free forever: most follow the same promotional structure — free for the first seven months, then billed at the standard rate (often around KRW 30,000, ~$22) starting in month eight. Because there’s no contract, you can port your number to a different zero-won promo right before the discount ends — a strategy some call “grasshopping” (메뚜기, literally “grasshopper,” for hopping from deal to deal) — but that means repeating the whole activation process every time.
• A wide range of deep-discount promos: including cashback, you can find 5G unlimited plans running roughly KRW 7,000/mo ($5, reverting to KRW 41,000/$30 after 6 months), and unlimited-text plans on the LG U+ network around KRW 19,000/mo ($14, reverting to KRW 34,000/$25 after 6 months). Keep in mind these are real-world prices net of cashback, not the plan’s official listed rate.
• Throttled-data and calls-only plans are another strength: fully throttled unlimited data at 3Mbps starts around KRW 13,750/mo ($10), and unlimited calls/texts plans start around KRW 9,900/mo ($7). For seniors who mainly call and text, or for a second phone that barely touches data, this tier is the most sensible choice.
• eSIM support is expanding fast: Moyo (a Korean mobile-plan comparison and shopping site), KT M Mobile, LG HelloMobile, and others now run dedicated eSIM plan pages and support self-activation for SIM-free phones. MVNOs got a later start here than the Big 3, but they’re closing the gap quickly.
• Policy-driven pressure is mounting: as the Big 3 expand their own cheap unlimited plans, MVNOs’ core “cheap” differentiator is being diluted, and some in the industry warn that independent MVNOs are being squeezed out by zero-won promotions from the carrier-affiliated MVNO brands — a slow-motion “starvation” some have flagged as a real risk.

3. Benchmarking Data Cost Per Gigabyte

The most practical yardstick in any mobile phone plan comparison is simple: how many gigabytes do you get per KRW 10,000 spent? Now that unified plans have arrived, this math is easier than ever to do across tiered plans.

[Tiered-plan data cost ranked — as of August 2026, GB per KRW 1,000]
LG U+ Data Plan 150GB : ⭐⭐⭐⭐⭐ 150GB / KRW 75,000 (~$56) ≈ 2.00GB
SKT Lite79            : ⭐⭐⭐⭐☆ 250GB / KRW 79,000 (~$59) ≈ 3.16GB (throttles to 5Mbps once used up)
KT 5G Simple          : ⭐⭐⭐☆☆ 110GB / KRW 61,000 (~$45) ≈ 1.80GB (sources conflict — verify)
LG U+ Data Plan 125GB : ⭐⭐⭐☆☆ 125GB / KRW 70,000 (~$52) ≈ 1.79GB
SKT Lite69            : ⭐⭐☆☆☆ 110GB / KRW 69,000 (~$51) ≈ 1.59GB

Judging by the numbers alone, SKT Lite79 looks like the best per-gigabyte value — but remember that once you burn through that 250GB, speed drops to 5Mbps. The fully unlimited tiers (Best, Plus Plan, Choice) don’t have a data cap to begin with, so a per-GB calculation doesn’t even apply to them. If you’re a heavy user, the question to ask first isn’t which plan has the best per-GB rate — it’s whether you’re getting genuinely unlimited data or just QoS-throttled unlimited.

The KT figures deserve an extra note of caution. Since the July 2026 overhaul, exact plan names and prices have been reported differently across sources — Moyo.com lists “5G Simple, KRW 61,000/110GB,” while Namuwiki (a Korean collaborative wiki similar to Wikipedia) lists “a 30–110GB tier at KRW 61,000–69,000.” We’re presenting these as a reference range only, and recommend confirming the final details on KT’s official plan page before you sign up. SKT and LG U+, by contrast, show consistent figures across multiple sources, so we’re more confident in those numbers.

4. The Complete Plan and Price Comparison

[Ranked by lowest entry price — fully unlimited plans only]
LG U+ Data Plan MAX     : KRW 85,000 (~$63) — eligible for the 25% SIM-only discount (for subscribers who skip the device-purchase subsidy)
SKT Best89              : KRW 89,000 (~$66) — KRW 66,750 (~$49) with the 25% SIM-only discount
KT Choice/Unlimited     : from roughly KRW 80,000 (~$59) — sources conflict, confirm officially
MVNO 5G Unlimited       : ~KRW 7,000 (~$5) after cashback — 6-month promo, then KRW 41,000 (~$30)

[Ranked by lowest price overall — bare-bones value plans]
MVNO calls/texts unlimited : from KRW 9,900 (~$7)
LG U+ Data Plan 300MB      : KRW 28,000 (~$21) — QoS unlimited, throttles to 400Kbps after
KT 5G Slim                 : KRW 37,000 (~$27) — 4GB/day, throttles to 400Kbps after
SKT Lite39                 : KRW 39,000 (~$29) — 6GB, throttles to 400Kbps after

💰 Detailed Plan and Price Comparison Table

Three hidden-cost issues are worth flagging here. First, switching to a unified plan doesn’t automatically mean paying less — the press has repeatedly pointed this out. Someone who was only using 8GB a month on their old plan can easily end up on a pricier tier after switching, so check your actual data use over the last three months before you make the move. Second, an MVNO’s “zero-won” price is really just a seven-month promo. Starting in month eight, the standard rate kicks in (often around KRW 30,000, ~$22), and unless you port your number to a different zero-won deal at that point, your real cost jumps sharply. Third, bundle discounts are a variable that never shows up on the plain price list. LG U+‘s terms are flexible enough that even MVNO subscribers can get a bundle discount, whereas SKT and KT concentrate their bundling structure on their own direct plan subscribers — so MVNO users on those networks need to look for a separate internet/IPTV bundle deal instead.

5. Final Recommendations by User Type

🎯 1) The Heavy Data User Who Streams YouTube and OTT All Day

• Best pick: SKT’s Best series or LG U+‘s Plus Plan
• Why: you need a top-tier plan that’s fully unlimited and also generous with tethering data. As our Netflix vs. TVING and other OTT streaming services comparison shows, anyone juggling multiple streaming subscriptions at once will have a much less stressful time on a genuinely unlimited tier where running out of data simply isn’t a worry.

🎯 2) The Value-Focused User Who Mainly Calls and Texts and Barely Touches Data

• Best pick: an MVNO’s unlimited calls/texts plan (from KRW 9,900, ~$7)
• Why: you get unlimited calls and texts for far less than even the Big 3’s cheapest plans (roughly KRW 30,000–40,000). If you barely need data, there’s no reason to pay for the data allowance baked into a Big 3 plan.

🎯 3) Young Adults Aged 19–34

• Best pick: stick with whichever of SKT, KT, or LG U+ you’re already on, and check whether the automatic youth perks have kicked in
• Why: SKT gives you +20GB of tethering on Best plans plus extra data and discounts on Lite plans, and KT auto-applies “YDeom” — both with no separate application required. It’s more efficient to check whether your current carrier’s youth perks have already kicked in than to switch carriers looking for a better deal.

🎯 4) Seniors Aged 65 and Older

• Best pick: SKT’s Lite45/Lite39, or a KT plan with 65+Deom/75+Deom applied
• Why: on SKT, Lite45 and Lite39 specifically come with more data and calling minutes, plus a throttle speed bumped from 400Kbps to 1Mbps. KT does the same automatically — 65+Deom for ages 65–74 and 75+Deom for 75 and up — adding multiplied data and safety features with no separate sign-up needed.

🎯 5) The Value-Seeker Who Wants to Run an Unlocked Phone With No Contract

• Best pick: KT’s YOGO, or an MVNO throttled-unlimited plan
• Why: YOGO’s data allowance went up from 5GB to 8GB in January 2026, and bundling it with home internet gets you an extra KRW 5,500 (~$4) off your internet bill. If you want to go even further on value, MVNO’s 3Mbps throttled-unlimited plans (from KRW 13,750, ~$10) are also worth a look. If your usage skews toward apps that eat a lot of data, knowing which ones are heaviest — the way our Naver Map vs. Kakao Map vs. T Map and other map app comparison breaks down — can help you pick the right plan ahead of time.

🎯 6) The Household Trying to Cut Its Total Telecom Bill by Bundling Internet and IPTV

• Best pick: an LG U+ plan, or an MVNO running on the LG U+ network
• Why: LG U+ lets you get an internet bundle discount regardless of carrier or plan, making it the most flexible of the three. That’s a particularly good fit for households that already run cheap MVNO mobile plans but don’t want to give up the internet bundling perk.

6. Practical Tips and Common Mistakes

✅ Tip 1. Check Your Last Three Months of Data Use Before You Switch to a Unified Plan

Multiple reports since July 2026 have pointed out that the new unified plans aren’t automatically cheaper. Check your average monthly data use over the last three months in the T world, kt.com, or LG U+ app first, then use that number to work out whether a tiered plan (Lite/Data Plan) or a fully unlimited one (Best/Plus Plan) actually costs less — before you switch.

✅ Tip 2. Mark Your MVNO’s Month-8 Standard-Rate Switchover on Your Calendar

Most zero-won promos are structured as “free for seven months, standard rate from month eight.” Miss the switchover date and you’ll automatically get billed the standard rate (often around KRW 30,000, ~$22). If you plan to use your no-contract flexibility to “grasshop” to another zero-won deal right before the discount ends, line up your next plan ahead of time.

✅ Tip 3. Take Advantage of the “Optimal Plan Notification” System Rolling Out in H2 2026

Starting in the second half of 2026, a new system requires carriers to actively notify subscribers when a cheaper plan better matches their actual usage. If you get one of these notifications through T world, kt.com, or the LG U+ app, don’t ignore it — actually running the comparison is the single easiest way to cut your phone bill.

✅ Tip 4. eSIM Activation Is Faster and Cheaper Than You’d Expect

For self-activating an unlocked phone, both SKT and KT take roughly 10–15 minutes to activate an eSIM, and both charge the same issuance fee of KRW 2,750 (~$2). MVNOs support eSIM too — through Moyo, KT M Mobile, LG HelloMobile, and others — so you can get activated the same day without waiting for a physical SIM to arrive in the mail.

✅ Tip 5. Double-Check Whether Your Age-Based Perks Are Actually Applied

SKT’s youth and senior perks, and KT’s SchoolDeom, YDeom, 65+Deom, and 75+Deom, are all supposed to apply automatically by age with no separate application. In practice, though, “automatic” doesn’t always mean it actually shows up — so open your plan details in the T world or kt.com app and confirm the perk is actually listed, rather than assuming it’s there.

✅ Tip 6. Learn to Tell “Fully Unlimited” Apart From “QoS Unlimited”

LG U+‘s cheapest plan (KRW 28,000, ~$21) and SKT’s or MVNOs’ throttled-unlimited plans are all “QoS unlimited” — meaning the speed drops to somewhere between 400Kbps and 3Mbps once you use up the allowance. To get genuinely full-speed unlimited data, you need to pick one of the top-tier plans explicitly labeled that way — Best, Plus Plan, or Choice. If you frequently send files or videos through messaging apps, it’s also worth checking the per-app data patterns covered in our KakaoTalk vs. Telegram vs. Discord and other messenger app comparison.

7. Frequently Asked Questions (FAQ)

Q. What’s the first thing I should check when comparing mobile phone plans?

Your average data use over the last three months. Since both SKT and LG U+ reorganized into unified plans in July 2026, the price gap between tiered and fully unlimited plans has become more pronounced than before — so if you don’t know your actual data usage, it’s surprisingly easy to end up switching to a pricier plan instead of a cheaper one.

Q. What exactly are the 2026 “unified plans”?

Plans that eliminate the old 5G-versus-LTE split and merge everything into a single system. LG U+ launched its unified lineup on 1 June 2026 and SKT followed on 1 July 2026; in the process, the total number of plans across all three major carriers went from roughly 700 down to about 200.

Q. What is Ansim Data?

A feature that lets you keep using data after you hit your allowance, without any extra charges — just at a reduced speed. It was auto-applied to 107 LTE plans starting 1 July 2026, and a similar QoS (throttled-unlimited) option now comes built into the 5G unified plans as well.

Q. Are MVNO “zero-won” plans really free?

No. Most follow a promotional structure of “free for seven months, standard rate (often around KRW 30,000, ~$22) from month eight.” Since there’s no contract, you can port your number to another zero-won plan before the discount ends, but that means going through the activation process all over again each time.

Q. Is it still okay to stay on SKT after the USIM data breach?

The government formally ruled SK Telecom responsible for the April 2025 USIM data breach, which affected roughly 23.24 million subscribers, and the company ran a roughly 10-day penalty-free cancellation window in the first half of 2026. If you stuck around through that window, staying is reasonable given the security improvements the company has since rolled out — though plenty of privacy-conscious subscribers did use the moment as a prompt to port out to another carrier.

Q. Who is KT’s YOGO plan best for?

Value-focused users running an unlocked phone with no contract. As of 5 January 2026, “YOGO 30” data went up from 5GB to 8GB, and bundling it with home internet knocks an extra KRW 5,500 (~$4) off your internet bill each month.

Q. Which of the Big 3 carriers has the largest market share?

As of a May 2026 report from News1 (a major Korean newswire), SKT still leads at 39.17%, though other outlets have reported figures as different as 45% or 35.5% — likely because they use different counting methods (whether all lines are included, whether MVNOs are counted, and so on). For the most accurate, up-to-date figures, check the wireless subscriber statistics published directly by the Ministry of Science and ICT (MSIT).

Q. Which carrier offers the best bundle discount?

LG U+ is the most flexible of the three. If you’re on an MVNO plan running on the LG U+ network, you can apply for a bundle discount when you sign up for home internet, regardless of carrier or plan — a particularly good deal for households that want both MVNO-level savings and a bundle discount at the same time.

8. Conclusion: The Practical Takeaway From This 2026 Mobile Phone Plan Comparison

As of August 2026, this mobile phone plan comparison boils down to one sentence: in the era of unified plans, your actual usage matters more than the plan’s name. LG U+ launched its unified lineup in June and SKT followed in July, and the total number of plans has shrunk dramatically — but that doesn’t mean everyone is automatically paying less. Checking your data usage over the last three months, and using that number to work out whether a tiered or fully unlimited plan suits you better, has become more important than ever.

In practical terms, it comes down to your usage pattern. Heavy data users should go for a top-tier fully unlimited plan like SKT’s Best or LG U+‘s Plus Plan; light, value-focused users should go MVNO for the deepest discounts; anyone who prefers an unlocked phone with no contract should look at KT’s YOGO; and households that care about bundling home internet should lean toward LG U+. Splitting your decision this way lets you capture each option’s specific strength. One caveat: KT’s July 2026 plan names and prices are reported inconsistently across outlets, so confirm the details on the official site before signing up — and if you go the MVNO zero-won route, make absolutely sure you don’t miss the month-8 switchover to the standard rate.

[Summary: the right pick for your situation]

Heavy data user (lots of OTT/streaming)
  → SKT Best series or LG U+ Plus Plan (fully unlimited)

Calls/texts-focused value user
  → MVNO unlimited calls/texts plan (from KRW 9,900, ~$7)

Young adults (19–34)
  → Check your current carrier's automatic youth perks (SKT / KT YDeom / LG U+)

Seniors (65+)
  → SKT Lite45/Lite39, or KT 65+Deom/75+Deom

Unlocked phone, no-contract value-seeker
  → KT YOGO, or an MVNO throttled-unlimited plan

Household that needs an internet bundle
  → LG U+ (also the most flexible for MVNO bundling)

This isn’t a software project, but the same principle applies: figure out how you actually use your phone first, then layer the latest plan on top of that — and you’ll avoid an unpleasant surprise on your bill every month.