eSIM for Japan

Ovosim Japan eSIM

3.6 out of 5 review rating, from(19 reviews)Global reseller21 plans from $0.33

21 plans on au and Rakuten Mobile. 5 GB for a week from US$6.37. Prices checked .

Is Ovosim good for Japan?

Ovosim runs on au 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$6.37, the 14th cheapest of the 60 providers with a week plan. 5G on every plan. Hotspot allowed. 4 unlimited plans. Review rating 3.6 out of 5 from 19 customer reviews. How we rank Ovosim.

Japan plans

DataPriceCompare
100 MB
7 days
$0.33
1 GB
7 days
$3.32
3 GB
5 days
$4.45
3 GB
15 days
$5.55
3 GB
30 days
$6.66
5 GB
15 days
$6.52
5 GB
30 days
$6.37
10 GB
15 days
$9.48
10 GB
30 days
$8.89
12 GB
30 days
$11.85
15 GB
30 days
$14.22
20 GB
30 days
$16.00

Ovosim speed and data rules

Ovosim data rules by plan type
Data at full speedWhen it runs outPlans
UnlimitedSlows to 1 Mbps after a usage limit for the rest of the planBrowsing and music, not HD video4 plans
100 MB to 60 GBOvosim doesn't say17 plans

Ovosim: “after the allotted data is used the speed is reduced to 1 Mbps” Source

Ovosim ratings from customer reviews

19 reviews: 17 on Trustpilot and 2 on the App Store, written 6 Aug 2025 to 4 Nov 2026. 0 of them are about a trip to Japan. Each rating needs at least 10 reviews that mention it.

Review rating3.6 out of 5The mean of the ratings below

Ovosim ratings by aspect
AspectRatingReviews that mention it
SpeedNot enough reviews3 reviews
Coverage3.6 out of 513 reviews
SetupNot enough reviews6 reviews
SupportNot enough reviews4 reviews
ValueNot enough reviews3 reviews
AppNot enough reviews1 review
Data problemsNot enough reviews
Refund problemsNot enough reviews

Ovosim speed tests in Japan

No published speed tests of Ovosim 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.

  • KDDI (au)
    Download
    67.85 Mbps
    Time on 5G
    48.8%
  • 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
KDDI (au)67.85 MbpsNot published48.8%Not published
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.