🇯🇵 eSIM plans for Japan

Starting at $3.64/day*

No data caps
7-days valid
Fast, reliable connection
Skip the roaming bill
QR code emailed instantly

Get your unlimited data

How many days

More days, lower daily rate

How many eSIMs

More eSIMs, bigger discount

Total

—

Get Japan eSIM

Install it now or once you're away. Nothing starts counting until you reach your destination and switch the eSIM on.

* The "as low as" figure is the lowest per-day rate, taken from the longest unlimited data plan on sale here.

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Why buy from us?

Here's how Onetel stacks up against other options in Japan.

Onetel

Local SIM card

Roaming

Uncapped data plans

Activates instantly

Your number stays the same

No surprise charges

No lock-in

24/7 support

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eSIM costs for Japan

Prices shown in USD

7 days of unlimited data in Japan costs $26.24 — about $3.75 a day on NTT Docomo, KDDI (au) or SoftBank, with no roaming charge and no SIM to swap. In Japan, 5G is live and median mobile download speed is 55.2 Mbps.

Duration	Data	Price	Daily cost
1 day	500 MB	$5.46	$5.46/day
3 days	—	$12.04	$4.01/day
5 days	—	$19.14	$3.83/day
7 days	100 MB	$26.24	$3.75/day
10 days	—	$36.88	$3.69/day
15 days	2 GB	$54.58	$3.64/day
30 days	3 GB	$4.10	$0.14/day
180 days	50 GB	$56.00	$0.31/day

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Which networks you connect to in Japan

Your eSIM roams onto Japan's own operators. These are the networks and the frequencies they run — check your phone supports them before you travel.

Operator	4G / LTE bands	5G bands	5G
NTT Docomo	B1, B3, B19, B21, B28, B42	n28, n77, n78, n79, n257	Yes
KDDI (au)	B1, B3, B11, B18, B26, B28, B41, B42	n28, n77, n78, n257	Yes
SoftBank	B1, B3, B8, B11, B28, B41, B42	n28, n77, n78, n257	Yes
Rakuten Mobile	B3, B28	n77, n257	Yes

55.2 Mbps

Median download

10.3 Mbps

Median upload

Source: Ookla Speedtest Global Index, July 2025

Coverage in Japan

Subway and underground rail tunnels in Tokyo and Osaka have near-universal LTE/5G coverage, but mountainous rural areas in central Honshu and Hokkaido have significant coverage gaps. Band 11 (1500 MHz) and Band 18/26 (800/850 MHz) are Japan-specific LTE bands often absent from foreign phones, limiting rural and indoor coverage for roaming devices.

Common Questions

The details worth knowing about your Japan eSIM

The facts do not specify coverage in the Seikan Tunnel. In Tokyo and Osaka, subway and underground rail tunnels have near-universal LTE/5G coverage. For this specific tunnel, you should expect possible signal loss, especially if your phone lacks Japan-specific bands like Band 11 or Band 18/26.

This FAQ section is for Japan only. The facts provided do not mention coverage in any other country, including South Korea. You would need to check the separate product page for multi-country or regional eSIMs to confirm whether Japan and South Korea are bundled.

The facts list four operators: NTT Docomo, KDDI (au), SoftBank, and Rakuten Mobile. The specific network your eSIM uses depends on your eSIM provider’s roaming agreements. This page does not state a single default network.

Yes. Band 11 and Band 18/26 are Japan-specific LTE bands often absent from foreign phones. The facts indicate their absence limits rural and indoor coverage. In mountainous rural areas of central Honshu and Hokkaido, where significant coverage gaps already exist, you may experience weaker signal.

The facts provided do not mention any ID registration rules for eSIMs. Japanese law previously required ID for physical SIMs but regulations for eSIMs may differ. For your specific eSIM product, you should check the provider’s purchase flow for any identification steps.