Japan eSIM vs pocket WiFi: which is better for your trip?

We read the week prices of 4 pocket WiFi rental companies on their own websites on 2026-10-13 and set them beside RedSim's Japan eSIM. Yen prices are converted at 158.6 yen to the US dollar, the rate on 2026-10-12.

Up to 3 travelers: the eSIM
One eSIM each costs less than the cheapest unlimited rental for up to 3 travelers, and there is nothing to collect, charge or post back.
4 or more who stay together: pocket WiFi
From 4 travelers sharing one router, the rental costs less than an eSIM each, as long as everyone stays within its range.
Or share one eSIM
Every RedSim eSIM works as a hotspot, so one plan can also cover a partner's phone or a laptop with nothing extra to carry.

What a week costs for one traveler

Option	7 days
Unlimited data
RedSim eSIMUnlimited, 7 days. Full speed for 3 GB a day, then 1 Mbps	$18.05
eConnect JapanUnlimited Plan, SoftBank	¥9,350≈ $58.95
Sakura MobilePocket WiFi Unlimited data, docomo	¥9,900≈ $62.42
Japan WirelessThe ONE Plan, SoftBank	¥9,960≈ $62.80
About 20 GB
RedSim eSIM20 GB, 30 days	$21.95
eConnect JapanEconomy Plan, SoftBank	¥5,280≈ $33.29
RentalwifiStandard Wifi, SoftBank	¥5,530≈ $34.87

Rental prices are each company's 7-day price on its own website, read on 2026-10-13, before optional insurance. A RedSim plan that lasts longer than the week is shown when it is the cheapest one covering it. Japan Wireless's price comes from its own price calculator and includes its airport delivery fee.

What a group pays for a week of unlimited data

Travelers	An eSIM each	One shared router
1	$18.05	≈ $58.95
2	$36.10	≈ $58.95
3	$54.15	≈ $58.95
4	$72.20	≈ $58.95

The router is the cheapest unlimited rental above, eConnect Japan.

Day to day

RedSim eSIM	Pocket WiFi
Getting it
Installed on your phone before you fly	Collected at an airport counter or post office, or delivered to your hotel, with your passport
Returning it
Nothing to return	Posted back in a prepaid envelope by a deadline
Battery
Runs on your phone, no extra device	8 to 20 hours per charge
Devices
Your phone, plus others through its hotspot	Up to 15 devices on one router
Splitting up
Everyone stays online on their own phone	Phones must stay within range of the router
If it is lost
Nothing to pay	¥10,000 to ¥30,000 for the router
Network
NTT docomo, SoftBank, and au 5G	SoftBank and docomo

Where the rental figures come from

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More details

eSIM or pocket WiFi in Japan: questions

For one traveler, yes. A week of unlimited data costs $18.05 with RedSim, against ¥9,350 (about $58.95) for the cheapest unlimited pocket WiFi we found, at eConnect Japan, read on 2026-10-13.

One eSIM each costs less for up to 3 travelers. From 4 travelers sharing one router, the pocket WiFi costs less, as long as everyone stays near it and someone carries and charges it. One RedSim eSIM can also share its data with other phones through the hotspot.

The data never runs out, and the first 3 GB each day run at full speed. After that the speed is 1 Mbps until the next day, which still covers maps, messages and social media.

Not with an eSIM: it stays on your phone and simply ends. A pocket WiFi has to be posted back in its prepaid envelope by the return deadline, and a lost router costs ¥10,000 to ¥30,000.

Then a pocket WiFi is the simpler choice. Most iPhones from the XR on and most recent Android phones support eSIM. Check your model here.

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