KT M Mobile's mobi eSIM offer cuts four Asia plans to 990 won a day
KT M Mobile has opened a Chuseok promotion for its mobi travel eSIM service, with selected unlimited Japan, mainland China, Taiwan and Vietnam plans priced at KRW 990 per day. The sale runs from September 4 through September 30, 2026.
The official event page had recorded more than 554,000 views by September 7. The strongest prices are limited to short three-day and four-day packages, and the separate zero-won first-purchase offer can end early when its allocation is used.
The traveler answer: KRW 2,970 for three days or KRW 3,960 for four days is a strong short-trip price when the exact mobi package fits. Read the data policy and issuance clock before buying. Roaming eSIM is easier to compare when you need a different trip length, named network choices or a plan selected outside the Korean purchase flow.
Which mobi eSIM plans cost 990 won per day?
KT M Mobile lists the following sale prices:
| Destination | Three-day price | Four-day price | Published reduction |
|---|---|---|---|
| Japan | KRW 2,970 | KRW 3,960 | 68% to 69% |
| Mainland China | KRW 2,970 | KRW 3,960 | 73% |
| Vietnam | KRW 2,970 | KRW 3,960 | 72% to 73% |
| Taiwan | KRW 2,970 | KRW 3,960 | 68% |
These are selected "fully unlimited" offers shown on the campaign page. They are not evidence that every mobi country, duration or package costs KRW 990 per day.
The promotion is available through the mobi purchase flow after phone-number and email verification. KT M Mobile says the buyer does not need to be an existing KT M Mobile subscriber.
The zero-won headline is a separate first-purchase offer
The event also advertises a first purchase at KRW 0 for selected three-day daily-data products in the same four countries. The page labels them as 1+1 products and warns that the free allocation may end before September 30 when stock is exhausted.
Do not assume the zero-won benefit applies to the fully unlimited plan. Open the eligible product and confirm that the final payment screen actually shows zero before completing the order.
The checked page does not publish the remaining stock, a universal eligibility definition for every prior mobi transaction, or a stacking rule with the KRW 990 plan. Treat the two offers as alternatives unless checkout clearly says otherwise.
"Unlimited" has two meanings on the mobi page
Mobi separates daily-data plans from fully unlimited plans. Its daily options supply 1GB or 2GB of high-speed data each day, then continue at a stated reduced speed. The page shows 384Kbps as the post-allowance example.
The campaign's short plans are labeled fully unlimited, but a buyer should still open the product terms for network management, hotspot use and any prohibited usage. A headline without a fixed gigabyte cap does not promise a particular speed everywhere or extra capacity in a crowded airport.
For another provider, the word unlimited can mean a different daily high-speed allowance and refresh time. Compare those fields rather than treating the label as a standardized product.
You can test registration before leaving Korea
Mobi offers an optional pre-departure activation check. KT M Mobile says the check confirms that the profile has registered correctly without consuming data or service days. If the traveler skips it, the plan should start when the eSIM is switched on at the destination according to the selected product.
That is useful, but it is not an overseas coverage test. A successful check in Korea cannot prove indoor signal, congestion or the exact partner network at the destination. Keep tickets, hotel details and the support route offline.
Watch the 180-day issuance and 90-day validity clocks
KT M Mobile says an eSIM can be issued within 180 days after purchase. Once issued, the profile has a 90-day validity window. The page summarizes the maximum purchase-to-use span as 270 days.
Those clocks matter if the offer is bought for a later trip. Do not issue the profile immediately unless the travel date fits the 90-day window. Save the purchase date, issuance deadline and planned activation date together.
Mobi also allows an unissued purchase to be gifted. The recipient should verify device compatibility and use the same phone number and email details required by the transfer flow before the issuance clock expires.
mobi or Roaming eSIM for these four countries?
Mobi is compelling for a Korean buyer taking a three-day or four-day trip during the promotion. It also provides Korean-language support and an optional registration check.
Roaming eSIM offers a public plan catalog without requiring the traveler to enter the mobi app first. It shows allowance, validity, listed operators, network speed and top-up eligibility. Support is available 24/7.
🏆 Roaming eSIM wins on route and package choice: it is easier to compare a short fixed allowance, a daily plan or a longer stay for the exact destination. Mobi wins when its Korean checkout confirms the KRW 990 campaign price and the short duration matches the trip.
The September 7 catalog check found South Korea plans using LG U+ and SK Telecom on the sampled package. That is a separate inbound-Korea comparison, not proof about the networks used by mobi in Japan, China, Taiwan or Vietnam.
Compare the four destination pages
Check a Japan Roaming eSIM, China Roaming eSIM, Taiwan Roaming eSIM or Vietnam Roaming eSIM against the exact mobi checkout.
For travel during Korea's holiday period, the Chuseok 2026 travel guide covers trains, closures and domestic trip planning. This news page owns only the mobi campaign terms.
Ten questions about the KT mobi promotion
When does the mobi Chuseok offer end?
The published campaign runs through September 30, 2026. The zero-won allocation may end earlier.
Which countries get the KRW 990 daily price?
Japan, mainland China, Vietnam and Taiwan on the selected three-day and four-day plans shown on the event page.
Is every mobi eSIM KRW 990 per day?
No. The price applies only to the listed promotional packages.
Is the first eSIM really free?
Selected first-purchase three-day daily-data products are advertised at KRW 0 while the allocation remains. Confirm the final total.
Does the free offer include the fully unlimited package?
The page presents the free 1+1 product and the KRW 990 fully unlimited product separately. Do not assume they stack.
Can a non-KT customer buy it?
KT M Mobile says buyers can use the mobi flow regardless of their mobile carrier after phone and email verification.
When should I issue the eSIM?
Within 180 days of purchase and close enough to travel that the separate 90-day validity window will not expire.
Does the pre-departure check use data or start the plan?
KT M Mobile says it does neither. The check verifies registration before departure.
Does mobi include a local phone number?
The campaign describes travel data while the existing SIM remains available for calls and texts. Do not assume the eSIM adds a destination number.
Is mobi always cheaper than Roaming eSIM?
No. It is highly competitive for the listed short trips. Compare the final price, trip length, networks, data policy, hotspot and support needs.
KT mobi campaign source record
KT M Mobile's official Chuseok event page establishes the September 4 to 30 period, four destinations, promotional prices, zero-won stock warning, daily-data distinction, pre-departure check, issuance clocks, gifting and support hours. Its event index supplies the current public view count.
Update policy: We will update this URL if KT M Mobile changes prices, availability, stock, destinations, data policy, issuance timing, activation check, gifting or support terms.
