T-Mobile roaming in Japan or a travel eSIM?
Travelling from the US to Japan? Here is what T-Mobile's International Pass costs for your trip, next to today's cheapest travel eSIMs. T-Mobile prices are from T-Mobile's own website (checked 11 October 2026); eSIM prices are checked every day.
eSIM prices checked 14 November 2026 · Virgin Connect Roam prices checked 10 November 2026
For 7 days with social media, browsing, photo uploads and some video calls (about 5.6 GB), the cheapest travel eSIM costs $4.99 with shibaSIM, against $50.00 with T-Mobile. That is about $45.01 less.
Check your T-Mobile plan first: many plans already include data in Japan (see “What T-Mobile says” below). If yours includes enough data, roaming may cost you nothing extra and you may not need an eSIM.
Trip by trip
| Trip | T-Mobile International Pass | Cheapest travel eSIM | Cheapest unlimited eSIM | eSIM vs T-Mobile |
|---|---|---|---|---|
| 3 days Social media, about 2.4 GB | $25.00 5 × 1-day pass (512 MB) | $3.31 Roam2Go: 3 GB plan, valid 3 days | $3.39 shibaSIM · Full speed 1 GB a day, then 256 kbps | $21.69 less |
| 7 days Social media, about 5.6 GB | $50.00 1 × 10-day pass (15 GB) | $4.99 shibaSIM: Unlimited data, 7-day pass | $4.99 shibaSIM · Full speed 1 GB a day, then 256 kbps | $45.01 less |
| 14 days Social media, about 11.2 GB | $70.00 4 × 1-day pass (512 MB) + 1 × 10-day pass (15 GB) | $8.09 shibaSIM: Unlimited data, 15-day pass | $8.09 shibaSIM · Full speed 1 GB a day, then 256 kbps | $61.91 less |
| 14 days Streaming video, about 28 GB | $75.00 1 × 30-day pass (30 GB) | $13.09 shibaSIM: Unlimited data, 15-day pass | $13.09 shibaSIM · Full speed 1 GB a day, then 256 kbps | $61.91 less |
Each eSIM price is the cheapest way to cover the whole trip with enough data. Tap a price to open the plan.
What T-Mobile says
International Pass: 512 MB for 1 day for $5, 15 GB for 10 days for $50, or 30 GB for 30 days for $75, with high-speed data and unlimited calling.
- Many T-Mobile plans already include data in Japan: 30 GB high-speed on Better Value, 15 GB on Experience Beyond and Go5G Next, 5 GB on Experience More, Go5G Plus, MAX and One Plus, and unlimited data at 256 kbps on Go5G, Magenta and One. If your plan already includes enough, you may not need to pay for anything.
- Other T-Mobile plans pay $1.00 per MB.
Source: T-Mobile: International Pass (checked 11 October 2026). Carrier prices change; your bill follows T-Mobile's current terms.
How to use an eSIM and keep your T-Mobile number
- Check that your phone supports eSIM and is not locked to T-Mobile.
- Buy a plan for Japan and install it over Wi-Fi a day before you fly.
- When you land, choose the eSIM for mobile data and turn on data roaming for the eSIM only.
- Keep your T-Mobile line on for calls and SMS codes, with its data roaming turned off.
More: all eSIM plans for Japan.
Questions
Is a travel eSIM cheaper than T-Mobile roaming in Japan?
For a 7-day trip with about 5.6 GB, T-Mobile International Pass costs $50.00 and the cheapest travel eSIM costs about $4.99 (shibaSIM, prices checked 14 November 2026). That is about $45.01 less with the eSIM.
Can I keep my T-Mobile number while using an eSIM?
Yes, on a phone with two SIMs. Keep your T-Mobile line switched on for calls and SMS codes, set the eSIM as your mobile data line, and turn off data roaming on the T-Mobile line so you are not charged for data.
How much does T-Mobile roaming cost in Japan?
International Pass: 512 MB for 1 day for $5, 15 GB for 10 days for $50, or 30 GB for 30 days for $75, with high-speed data and unlimited calling. (from T-Mobile's website, checked 11 October 2026).
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