eSIM for Japan

JamboSim Japan eSIM

3.6 out of 5 review rating, from(24 reviews)Global reseller13 plans from $2.99

13 plans on SoftBank, au and Rakuten Mobile. 5 GB for a week from US$6.99. Prices checked .

Is JamboSim good for Japan?

JamboSim runs on SoftBank, 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$6.99, the 15th cheapest of the 60 providers with a week plan. 5G on every plan. Hotspot allowed on some plans. 6 unlimited plans, 6 of them with 3 GB a day at full speed. Review rating 3.6 out of 5 from 24 customer reviews. How we rank JamboSim.

Japan plans

DataPriceCompare
500 MB
7 days
$2.99
1 GB
7 days
$3.99
2 GB
15 days
$4.99
3 GB
30 days
$4.99
5 GB
30 days
$6.99
10 GB
30 days
$9.99
20 GB
30 days
$14.99
Unlimited: 3 GB a day at full speed, then 1 Mbps until midnight Japan time
Unlimited
3 days
$8.99
Unlimited
5 days
$12.99
Unlimited
7 days
$15.99
Unlimited
10 days
$19.99
Unlimited
15 days
$35.99
Unlimited
30 days
$49.99

JamboSim speed and data rules

JamboSim data rules by plan type
Data at full speedWhen it runs outPlans
3 GB a daySlows to 1 Mbps until midnight Japan timeBrowsing and music, not HD video6 plans
500 MB to 20 GBJamboSim doesn't say7 plans

JamboSim: “3 GB of high-speed data per day, followed by speeds of about 1 Mbps” Source

JamboSim ratings from customer reviews

24 reviews on Trustpilot, written 10 Aug 2026 to 7 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

JamboSim ratings by aspect
AspectRatingReviews that mention it
SpeedNot enough reviews2 reviews
Coverage3.5 out of 514 reviews
Setup3.8 out of 516 reviews
SupportNot enough reviews8 reviews
ValueNot enough reviews4 reviews
AppNot enough reviews1 review
Data problemsNot enough reviews
Refund problemsNot enough reviews

JamboSim speed tests in Japan

1 published speed test of JamboSim in Japan, by Find Your eSIM.

  • Shiba Park, Tokyo272 Mbps
    Upload 59.4 MbpsLatency 17 ms
    Find Your eSIM, Aug 2026
Published speed tests of JamboSim in Japan
WhereDownloadUploadLatencyTested by
Shiba Park, Tokyo272 Mbps59.4 Mbps17 msFind Your eSIMAug 2026

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%
  • 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
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.