KT expands roaming as Korean travelers choose eSIM

KT has increased the data in its main overseas roaming plans after a Korean traveler survey put travel eSIM use ahead of carrier roaming. The revised Shared Roaming range now starts at 5GB and adds a 40GB option. KT has also doubled the daily high-speed allowance in two All-Day Roaming tiers.

The timing matters because Consumer Insight found that 36% of 1,497 recent Korean outbound travelers bought a travel eSIM for their most recent destination. Carrier data roaming followed at 34%. Travel eSIM use rose from 28% to 36% in one year, and 79% of users said they were satisfied. Carrier roaming satisfaction was 58%.

The traveler decision: KT customers should compare the new allowances, not the older 4GB, 8GB and 12GB figures still repeated on some pages. KT can suit a group that wants shared data and the usual mobile account. A Roaming eSIM can suit a traveler who wants a separate data line, a destination-specific allowance and no change to the home subscription.

KT now offers 5GB to 40GB of shared roaming data

KT's current data roaming page lists four Shared Roaming tiers for up to five people. Each now has a 30-day validity period.

The KRW 33,000 plan previously lasted 15 days. KT also extended the Y Shared Roaming range for customers aged 34 or younger. Its current 30-day options are 6GB for KRW 19,800, 11GB for KRW 26,400, 21GB for KRW 39,600 and 41GB for KRW 46,200.

KT also increased the daily high-speed allowance on All-Day Roaming Basic from 500MB to 1GB and on All-Day Roaming Plus from 1GB to 2GB. The plan terms continue after the daily allowance at a reduced speed, but the exact speed and voice inclusion depend on the selected tier.

The larger allowance is useful, but it does not settle the buying decision. Shared Roaming requires an eligible KT account and separate enrollment for the additional KT lines. A solo traveler who only needs data should still compare the total trip price, destination coverage and support terms with a separate Roaming eSIM.

KT adds airport and Grab benefits to the roaming comparison

KT is also using travel perks to make its home-carrier plan more competitive. The September update includes a KRW 10,000 discount on selected Incheon and Gimpo airport lounge access. A separate Grab Travel Pass benefit covers Vietnam, the Philippines, Thailand, Indonesia, Malaysia, Singapore and Cambodia.

The Grab code arrives by SMS after entry into a participating country and can be registered in the Grab app. The benefit applies while the available codes last. It should be treated as a conditional extra, not deducted from the roaming price unless the traveler will use it and receives the code.

This is one area where the usual line has a practical advantage. The carrier can deliver an account-linked benefit by SMS and keep native calls and messages under one relationship. A Roaming eSIM has a different strength: the traveler can compare data plans independently of the home carrier and select a country or regional route before departure.

LG Uplus is adding overseas membership perks

LG Uplus has joined the WanderJoy Travel Alliance and plans to launch an overseas membership service during 2026. Its Japan pilot ran from June through August for selected Roaming Pass customers and included discounts for Don Quijote, Lawson, GO Taxi, a Mount Fuji tour and NEWoMan.

LG Uplus said more than 10,000 coupons were downloaded during the pilot. Nine out of ten people who redeemed a coupon chose the Don Quijote or Lawson offers. The full service is expected to extend benefits through local carrier partners in markets such as Japan, Singapore and Taiwan.

The final eligibility rules matter. The pilot was tied to selected roaming customers, while reports about the full service describe broader app access. Travelers should wait for the live U+one terms before assuming a roaming plan, coupon or particular destination is included.

SK Telecom is taking a third approach by emphasizing app-based calls for roaming subscribers. Together, the three strategies show what home carriers can add beyond data: shared allowances, native-line continuity, calls and account-linked travel perks.

What the 2026 Korean travel eSIM survey found

Consumer Insight published the results on August 11. The analysis comes from its 43rd Mobile Telecom Survey and covers respondents who had visited another country within the previous 12 months.

The percentages are rounded, so the displayed total is 101%. That is a rounding effect, not evidence that respondents selected multiple primary data methods.

The question concerned the respondent's most recently visited destination. It did not ask which provider had the cheapest plan, which network was fastest or whether one method worked better in every country.

The trend is stronger than the two-point lead

The current result could be described as 36% versus 34%, but one survey wave alone would be a weak basis for calling a lasting change. The three-wave sequence is more informative.

Travel eSIM use rose from 28% in the first half of 2025 to 32% in the second half, then 36% in the first half of 2026. Carrier roaming moved from 32% to 31%, then 34%.

Consumer Insight says the second-half 2025 values were 31.9% for travel eSIM and 31.4% for roaming before rounding. In other words, the category first edged ahead by less than one point, then opened a displayed two-point gap in the next survey.

This does not prove the next survey must continue the same line. It does show that the latest result was not created by a single sudden jump from nowhere.

Satisfaction is the larger result

The usage difference between travel eSIM and roaming was two points. The satisfaction difference was 21 points.

Travel eSIM users most often selected low price as a reason for their choice, at 64%. Data allowance for the price followed at 43%, while 41% named simple application and activation.

Carrier roaming answered a different need. Its leading reason was the convenience of using the domestic phone number for calls and messages, selected by 45% of roaming users.

That distinction matters. A traveler can be highly satisfied with a data-only plan and still need the home line for a bank code. Another traveler may accept a higher roaming price because native calls, messages and one support relationship are worth more than a separate data budget.

Age changed which method led

The study found a clear age split, but age is a description of this sample rather than a buying rule.

Travel eSIM reached half of travelers in their 20s and 53% of those in their 30s. Roaming led among travelers in their 50s and those 60 or older. People in their 40s split evenly at 35%.

The result may reflect price, device familiarity, carrier relationships, trip style or support preferences. The study reports the difference but does not isolate one cause for every age group.

The teen subgroup was much smaller than the adult groups, so its percentages deserve extra caution. No age result should be treated as a prediction for an individual traveler.

Data mattered more than traditional voice calls

Paid data was nearly universal: 94% used a travel eSIM, roaming, a local SIM or pocket WiFi. Voice use was different.

• 44% neither made nor received a voice call abroad.
• 21% only received calls.
• 35% both made and received calls.
• Among the 835 voice users, 63% used a data-based calling app.
• Among the same voice users, 36% used carrier roaming voice calls.

KakaoTalk, FaceTime and WhatsApp were examples of data-based calling in the report. Across the full sample, Consumer Insight estimated that about 35% used app calls and 20% used roaming voice calls.

This supports the practical value of a data-first plan, but it does not make phone numbers irrelevant. Hotels, restaurants, delivery apps and local services can require a callable local number. Banks and online accounts can send verification messages to the usual number. Emergency calling and ordinary cellular voice also need separate checks.

Our calls and SMS with a Roaming eSIM guide explains the two-line setup and the limits of data-only packages.

What the study does not prove

The headline can be misread in several ways. These are the boundaries that matter:

1. It is a Korean outbound traveler study. The 36% figure is not a global adoption rate.
2. It measures a category, not Roaming eSIM. Consumer Insight did not rank individual travel eSIM providers.
3. It reports stated behavior. The study is an online survey, not network telemetry or purchase records.
4. It does not measure speed or coverage. A travel eSIM can use roaming agreements, and a home carrier can use the same visited network.
5. It does not prove a lower price on every trip. Included roaming, EU roaming rights, promotions and group plans can change the comparison.
6. The satisfaction score is not a network benchmark. It reflects the user's overall experience with the chosen method.
7. The age split is not a recommendation. A traveler's needs matter more than the average for an age group.

Global studies use different questions and denominators. For example, GSMA Intelligence reported that 12% of surveyed consumers who had traveled internationally in the previous year used an eSIM abroad in its 2025 Global Consumer Survey. That figure covers multiple markets and should not be placed beside the Korean 36% as if both surveys asked the same population the same question.

Travel eSIM, roaming, physical SIM or pocket WiFi

Use the survey as a shortlist, then make the trip-specific choice.

Home-carrier roaming can be the right answer when it is already included, the traveler depends on normal calls or the phone is locked. A local carrier plan can be better for a long stay that needs a local number. Pocket WiFi can still fit a group that remains together and accepts another device to charge.

Why Roaming eSIM has an evidence-backed edge

The Korean study supports the travel eSIM category, not one brand. Roaming eSIM's advantage must therefore come from facts visible in its own service, not from borrowing the survey's 79% satisfaction score.

🏆 Roaming eSIM wins on visible choice before checkout: its public destination cards show the retail price, data allowance, validity, speed label, named operators and package-level top-up status where supplied. A traveler can select a country or regional plan without changing the home mobile subscription, then keep the usual line available on a compatible dual-SIM phone.

Roaming eSIM also publishes 24/7 support and a WhatsApp contact route. Most plans are data-only unless the card says otherwise, and a package cannot make a locked or incompatible phone accept eSIM. Those limits remain part of the decision.

The live catalog returned 43 Japan, 31 Singapore, 34 Thailand and 37 United States package choices on September 2, for 145 listings across the four example cards below. Counts are plan choices, not unique networks, and inventory can change.

Use the travel eSIM versus carrier roaming guide for the broad cost and setup comparison. Check whether the phone supports eSIM, then review when to install it before travel.

A pre-trip decision checklist

• Price the home carrier for the exact countries and number of days.
• Check whether roaming is already included in the domestic plan.
• Confirm that the phone is both eSIM-compatible and carrier-unlocked.
• Decide whether the trip needs only data, the usual number or a local number.
• Check how bank codes and account messages will reach the usual line.
• Match the allowance to maps, messages, video, work and hotspot use.
• Read the validity start rule before installing or activating a plan.
• Confirm hotspot permission when a laptop or another traveler needs data.
• Check all border stops against the package coverage list.
• Save installation details, support contacts and essential bookings offline.

Ten questions after KT's roaming update

1. Is KT Shared Roaming a travel eSIM?

No. It is a roaming product attached to an eligible KT mobile account. A travel eSIM is a separate profile bought for the trip.

2. Can five people use one KT Shared Roaming plan?

KT lists the product for one to five people. The representative customer selects the additional KT numbers, and each added customer must enroll in the corresponding additional-line option. The allowance is shared rather than repeated for every person.

3. Does the new 40GB plan provide 40GB to each traveler?

No. KT describes it as a 40GB shared allowance for the enrolled group. Travelers should estimate the combined use of every phone before choosing the tier.

4. Are KT's airport lounge and Grab discounts guaranteed?

No. The lounge discount follows the KT Membership coupon and partner purchase process. Grab codes are limited to seven listed countries and available while supplies last.

5. Does the survey prove a travel eSIM is always cheaper than roaming?

No. Low price was the most common reason for choosing travel eSIM, but the study did not compare live prices for every carrier, destination and trip. A shared or included carrier benefit can cost less.

6. Can a Roaming eSIM keep my usual phone number?

The usual line can often stay installed on a compatible dual-SIM phone while the Roaming eSIM supplies data. Calls or messages on the home line can still trigger carrier charges.

7. Will a data-only plan receive bank SMS codes?

Not on its own. Keep the usual line available if the bank sends codes there, then verify the home carrier's incoming-message and roaming rules. Some services block or delay codes for reasons unrelated to the data plan.

8. Does my phone need to be unlocked for a Roaming eSIM?

Yes. A phone locked to the home carrier can reject another provider's profile even when the model supports eSIM. Only the locking carrier can confirm or remove that restriction.

9. Can I share a Roaming eSIM by hotspot?

Only when the selected package and device allow tethering. Check the card and remember that connected devices use the same allowance and fair-use policy.

10. Does higher satisfaction mean faster data?

No. The 79% result measures satisfaction with the travel eSIM method. It does not report latency, speed, local breakout, congestion or network priority.

Sources and updates

Consumer Insight's August 11 report contains the survey tables, question wording and method note. Its wider H1 2026 mobile study surveyed 30,226 people through mobile and PC, using quotas for sex, age and region. The travel analysis uses the 1,497 respondents who had been abroad in the previous year.

KT's live page provides the current plan sizes, prices, validity and supported-country counts. The September plan announcement provides the previous allowances and benefit changes. LG Uplus's WanderJoy announcement coverage provides its pilot figures and planned 2026 launch. KDDI's official WanderJoy page explains how the carrier alliance works in its existing markets.

Update policy: We will update this story when Consumer Insight publishes another wave or when KT, SK Telecom or LG Uplus materially changes the plans, eligibility, calls, benefits or destination coverage described here.