About 5 GB for a week in Japan
| Option | 7 days | |
|---|---|---|
| KT, about 5 GB for 7 days | 2 × 중국/일본 알뜰 로밍 | ₩50,000 |
| eSIM For U, 5 GB for 30 days | See eSIM plans | $9.39 |
| eSIM For U daily plan, 7 days | 1 GB per day | $10.69 |
Official price list of KT, checked 3 Nov 2026. Standard plans; older contracts may differ. Source Prices in different currencies, not converted.
All KT data options for Japan
| Data | Valid | Price | |
|---|---|---|---|
| 중국/일본 알뜰 로밍 | 3 GB | 5 days | ₩25,000 |
The KT options for Japan come straight from its official price list, each with its data, validity and price. Our prices are live for Japan.
Good to know before you travel to Japan
- Free Wi‑Fi is common in stations, convenience stores and cafés, but it usually needs a sign-up. Good as a backup, not as your main connection.
- Google Maps shows train and subway connections with fares, which makes the rail network in Tokyo and Osaka much easier to use.
eSIM plans for Japan
- Networks for JapanKDDI/au, NTT docomo, Rakuten Mobile and SoftBank
- SpeedUp to 5G on all four networks. Where there is no 5G, you connect over 4G/LTE.
- Internet runs viaSingaporeDepending on the plan. Banking or streaming apps may treat you as being there.
Questions and answers
How much does KT charge for data in Japan?
The table shows the cheapest official KT option for about 5 GB in a week, every KT data option for Japan, and the source with the date we checked it.
Is Japan included in KT plans?
Not in the standard plans of the KT price list we checked. In Japan you pay a pass, a daily charge or a price per MB.
Can I keep my KT number in Japan?
Yes. In Japan, keep the KT SIM for calls and texts and use the travel eSIM for data. Turn off data roaming on the KT line so it does not use data.
Where can I see all KT roaming charges?
On the KT roaming charges page, with every destination in the KT price list.
Updated 3 Nov 2026 · checked against our live catalogue
How we check our data · Prices and plans come live from our catalogue; facts come from official sources, listed where we use them.