Planning a museum day? Return to How to Book Ghibli Museum Tickets in 2026 for the ticket release, confirmation, and Mitaka–Kichijoji itinerary workflow.
Pick a data profile
For maps, messaging, translation, and occasional social media, a light or everyday-use plan may be enough. Video, cloud photo backup, live streaming, long video calls, and tethering can use substantially more data. Check your phone’s recent mobile-data report for a better estimate.
For most travelers using maps, translation, messaging, browsing, and moderate social media, 5 GB is a sensible starting point. Choose 10 GB when you expect frequent uploads or want a comfortable buffer. Unlimited data is mainly useful when video and large cloud transfers are part of the trip.
The comparison data below lives in a separate configuration file so plans and prices can be updated without rewriting the article layout.
| Provider | Plan and price | Best for | Hotspot and main trade-off |
|---|---|---|---|
| Saily | 5 GB / 30 days US$10.99 | Most 7-day trips: maps, messaging, browsing, and moderate social use Automatic on arrival after the eSIM and data roaming are enabled | Supported; official Japan page states unrestricted hotspot sharing Data-only; 5 GB can be tight for frequent video or cloud photo backup |
| Ubigi | 10 GB / 30 days US$16.50 | Heavier maps, social media, uploads, and travelers who want more buffer Smartstart begins the plan when the eSIM reaches Japan | Data sharing allowed Data-only; confirm the live currency and checkout total |
| Holafly | Unlimited data / choose trip days Check the live 7-day total | Frequent video, large uploads, or travelers who do not want to track a data balance Begins after arrival when the eSIM is turned on | Up to 1 GB per day on the current Japan plan Fair-use speed reductions may apply; hotspot data is not unlimited |
If you watch a lot of video
Look beyond the headline allowance. Verify whether the provider reduces speed after a threshold, applies a daily cap, restricts certain network use, or describes the plan as unlimited under a fair-use policy. Download entertainment over Wi-Fi when practical.
If you mostly use maps and social media
Maps, transit lookups, messaging, and moderate social posting are a different profile from continuous video. Offline maps can reduce data use, but confirm that saved areas cover your route and keep live data available for service changes.
If you need tethering
Confirm that the exact plan permits hotspot use and check whether tethered data has a separate limit. A plan labeled generous or unlimited does not automatically guarantee unrestricted tethering.
Check your phone before buying
Confirm all three points on authoritative sources:
- Your exact device model supports eSIM.
- The device is carrier-unlocked.
- The provider supports that model and the networks used in Japan.
Do not rely on appearance alone: the same phone family can have model or market variations.
Installation and activation
Read the provider’s instructions before scanning a QR code or installing a profile. Some plans begin at installation; others begin when they first connect to a supported network. That distinction must be verified for the chosen provider.
Keep the QR code and instructions accessible on a second screen or offline. Name the line clearly in phone settings, choose which line handles mobile data, and disable unexpected roaming on your home line according to your carrier’s guidance.
Comparison checklist
- Total data or fair-use rule
- Full-speed period and any throttling
- Validity start and end conditions
- Tethering permission
- Supported networks and coverage statement
- Top-up availability
- Device and operating-system support
- Support channel and refund terms
- Current total price in the checkout currency
Keep a backup plan
Save accommodation details and essential routes offline. Know where you can access trusted Wi-Fi, and keep your home carrier’s roaming settings understood before departure. A connectivity guide should reduce uncertainty, not promise perfect coverage everywhere.
Official sources
Update history
- Removed the unpublished affiliate placeholder while the Saily partner application remains under review.
- Replaced planning placeholders with a verified Saily, Ubigi, and Holafly comparison for a 7-day Japan trip.
- Usage framework and separated comparison data created. Provider names, plans, and prices remain pending verification.