eSIM for Japan

MobiMatter Japan eSIM

3.1 out of 5 review rating, from(503 reviews)Marketplace19 plans from $6.99

19 plans on Docomo, au, SoftBank and Rakuten Mobile. 5 GB for a week from US$7.99. Prices checked .

Is MobiMatter good for Japan?

MobiMatter runs on Docomo, au, SoftBank and Rakuten Mobile, strong in all 10 areas on our coverage map, with good 4G at all 28 rural and mountain places. A week with 5 GB costs US$7.99, the 18th cheapest of the 60 providers with a week plan. 5G on some plans. Hotspot allowed. 9 unlimited plans, 9 of them with 5 to 30 GB a day at full speed. Review rating 3.1 out of 5 from 503 customer reviews. How we rank MobiMatter.

Japan plans

DataPriceCompare
10 GB
30 days
$7.99
12 GB
30 days
$9.99
15 GB
30 days
$11.99
20 GB
30 days
$13.99
20 GB
30 days
$16.99
30 GB
30 days
$22.99
35 GB
60 days
$26.99
50 GB
30 days
$29.99
50 GB
30 days
$29.99
50 GB
30 days
$34.99
Unlimited: 30 GB a day at full speed, then 200 kbps, on 5 of 9 plans
Unlimited
3 days
$6.99
Unlimited
5 days
5 GB a day at full speed, then 200 kbps
$6.99

MobiMatter speed and data rules

MobiMatter data rules by plan type
Data at full speedWhen it runs outPlans
30 GB a daySlows to 200 kbpsMessages and maps only5 plans
5 GB a daySlows to 200 kbpsMessages and maps only4 plans
10 to 50 GBMobiMatter doesn't say10 plans

MobiMatter: “5 GB/day, 200 kbps afterwards” Source

MobiMatter ratings from customer reviews

503 reviews: 268 on the App Store, 163 on Google Play and 72 on Trustpilot, written 1 Sept 2020 to 13 Nov 2026. 18 of them are about a trip to Japan. Each rating needs at least 10 reviews that mention it.

Review rating3.1 out of 5The mean of the ratings below

MobiMatter ratings by aspect
AspectRatingReviews that mention it
Speed2.6 out of 549 reviews
Coverage2.8 out of 5214 reviews
Setup3.2 out of 5132 reviews
Support3.0 out of 5142 reviews
Value3.7 out of 5136 reviews
App3.4 out of 5105 reviews
Data problems4.8% of reviews24 of 503 reviews report one
Refund problems6.8% of reviews34 of 503 reviews report one

On trips to Japan: coverage 3.9 from 14 reviews.

MobiMatter speed tests in Japan

No published speed tests of MobiMatter in Japan.

How fast these networks are for their own customers

Ookla's median speeds for people on each network's own plans, H1 2026 unless marked.

  • NTT Docomo
    Download
    50.5 MbpsQ3 2025
    Time on 5G
    51.4%
  • KDDI (au)
    Download
    67.85 Mbps
    Time on 5G
    48.8%
  • SoftBank
    Download
    73.78 Mbps
    5G download
    153.55 Mbps
    Time on 5G
    41.4%
    Latency
    45 ms
  • Rakuten Mobile
    Download
    53.54 MbpsQ3 2025
    5G download
    124.59 Mbps
    Time on 5G
    37.4%
Ookla speeds for each network's own customers
NetworkDownload5G downloadTime on 5GLatency
NTT Docomo50.5 MbpsQ3 2025Not published51.4%Not published
KDDI (au)67.85 MbpsNot published48.8%Not published
SoftBank73.78 Mbps153.55 Mbps41.4%45 ms
Rakuten Mobile53.54 MbpsQ3 2025124.59 Mbps37.4%Not published

Sources: Ookla Speedtest Connectivity Report H1 2026 via TelecomLead, 17 Sept 2026; Ookla Speedtest Intelligence Q3 2025 via TelecomsTechNews, 15 Dec 2025.