eSIM or Pocket WiFi?
Almost every visitor to Japan needs mobile data. For one person with a recent phone, a travel eSIM is now the cheapest and fastest option. For a group, heavy shared use, or an older or carrier-locked phone, a rented Pocket WiFi still wins.
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THE SHORT VERSION
Get an eSIM if you are travelling alone or as a couple, your phone is unlocked and reasonably recent, and you mainly need maps, messaging and the occasional video. Get a Pocket WiFi if you are three or more people, you want to connect a laptop or tablet too, you will stream a lot, or your phone does not support eSIM. Skip the airport SIM-vending counters — they are the most expensive way to do this.
HOW THEY DIFFER
| Aspect | eSIM | Pocket WiFi |
|---|---|---|
| Setup | Buy online, install by QR code or the provider app before you fly, switch it on when you land. | Reserve online, collect at an airport counter or have it delivered to your hotel; return it by post or at a counter. |
| Devices | Covers one phone (some plans allow hotspot sharing, which drains battery). | A small router that connects roughly 5–10 devices at once. |
| Cost | Usually cheaper for one light user. | Per person often works out lower for a group splitting one device, or two-plus weeks of heavy use. |
| Battery & bulk | Adds nothing to carry. | Another thing in your bag, lasts about a day per charge — bring a power bank. |
Neither gives you a Japanese phone number by default — both are data only. That is fine for apps and internet calls, but some restaurant bookings and tickets want an SMS-capable local number.
MAIN PROVIDERS COMPARED
Prices and plans change constantly. Treat the figures below as indicative only and confirm the current rate on each provider’s own site before buying. The provider links are affiliate links.
| Provider | Type | Data | Price (indicative) | Devices | Best for | |
|---|---|---|---|---|---|---|
| Airalo | eSIM | 1–20 GB · 7–30 days | from ~US$4.50 | 1 (your phone) | Solo travelers who want the cheapest entry price and the widest country catalogue. | Check plans ↗ |
| Ubigi | eSIM | 1 GB – unlimited · 1–30 days | from ~US$5 | 1, hotspot on most plans | Frequent travelers; consistent network speed and easy in-app top-ups. | Check plans ↗ |
| Holafly | eSIM | Unlimited · 5–90 days | from ~US$6 / day | 1 (hotspot on selected plans) | Heavy data users who do not want to track a GB allowance. | Check plans ↗ |
| Ninja WiFi | Pocket WiFi | Daily unlimited-style plans | from ~¥1,000 / day | Up to ~5 | Groups and families; pickup counters at every major Japanese airport. | Check plans ↗ |
| Japan Wireless | Pocket WiFi | Daily unlimited-style plans | from ~¥900 / day | Up to ~10 | Longer stays and larger groups; hotel or post-office delivery before arrival. | Check plans ↗ |
DOES YOUR PHONE SUPPORT eSIM?
Rough model guide
| Brand | Eligible models |
|---|---|
| iPhone | XS, XR and every model since |
| Google Pixel | 3 and later |
| Samsung Galaxy | Most S20 and later |
Two catches: the phone must be carrier-unlocked, and some regional variants differ — iPhones bought in mainland China and some Hong Kong models use dual physical SIMs and have no eSIM.
If it does not
Use a Pocket WiFi, or buy a physical travel SIM (several of the same companies sell one). Do not count on buying a SIM after you arrive — the good deals are online and set up in advance.
BEFORE YOU GO
Install an eSIM while you still have WiFi at home — you usually cannot activate one without a connection. Keep your normal SIM in the phone for calls and SMS and let the eSIM handle data. Reserve a Pocket WiFi at least a few days ahead in peak season, note the return deadline and method, and pack the router, cable and pouch together so you do not lose a part and get charged for it.