Coverage in Japan: what to know
Opensignal rated NTT docomo strongest for coverage (9.0 of 10) and in rural areas, with au next (8.3). Rakuten Mobile won none of the coverage or availability awards and did not appear in the rural results.
Checked 3 Nov 2026. Sources: insights.opensignal.com, insights.opensignal.com. Coverage changes, so check your route before you rely on it.
The short answer
The best eSIM for Japan is the one that fits your trip and your networks. For two weeks of photos, maps and social, NUM picks 5 GB for 30 days at $4.79, as of 3 Nov 2026.
| Plans from | $0.79 on 3 Nov 2026 |
|---|---|
| Networks on local plans | KDDI/au, NTT docomo, Rakuten Mobile |
| A week | 3 GB, 15 days, $3.39 |
| Two weeks | 5 GB, 30 days, $4.79 |
| A month | 10 GB, 30 days, $6.89 |
| Longer | 50 GB, 180 days, $32.59 |
| Phone number | None, data only |
| Payment | Apple Pay, Google Pay or card |
Questions people ask about Hokkaido
Is there mobile signal at Hokkaido?
Guides report solid signal in Sapporo and Niseko but little or none inside Shiretoko and Daisetsuzan; docomo is described as having the widest rural reach.
How much does an eSIM for Japan cost?
On 3 Nov 2026, Japan plans started at $0.79 and went up to $32.59 for the biggest. The shop always shows today’s price, and the price on the pay button is the price you pay.
Which network works well in Japan?
Opensignal rated NTT docomo strongest for coverage (9.0 of 10) and in rural areas, with au next (8.3). Rakuten Mobile won none of the coverage or availability awards and did not appear in the rural results.
Which network works well in Japan?
Opensignal rated NTT docomo strongest for coverage (9.0 of 10) and in rural areas, with au next (8.3). Rakuten Mobile won none of the coverage or availability awards and did not appear in the rural results.
Why does my eSIM show another carrier’s name?
Many travel eSIMs are issued by one carrier and roam on local networks, so your phone can show the issuing carrier’s name while your data runs on a local network. Keep data roaming on for the eSIM.
Will it work on my phone?
Dial *#06# on the phone you’re taking. If you see an EID number, it takes an eSIM. Every iPhone from the XR and XS on does, and the SE from 2020, as do Google Pixel 3 and later and Samsung Galaxy S20 and later. The phone must be carrier-unlocked. Not sure? Text PHONE and your model and we’ll check.
When do I install it?
At home, on wifi, before you fly. Then switch it on when you land. Tell us your landing day and we text you the switch-on steps that morning.
Does it come with a phone number?
No. It’s a data-only eSIM. WhatsApp, LINE, iMessage and FaceTime all work over it, and your home number can stay on for calls and codes.
What if it doesn’t work?
If we can’t issue your eSIM, we refund you in full. If it won’t install or connect, text us and we help you get connected.