eSIM for Japan

iRoamly Japan eSIM

3.5 out of 5 review rating, from(70 reviews)Global reseller99 plans from $0.80

99 plans on Docomo, SoftBank and au. 5 GB for a week from US$2.60. Prices checked .

Is iRoamly good for Japan?

iRoamly runs on Docomo, SoftBank and au, 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$2.60, the cheapest of the 60 providers with a week plan. 5G on every plan. Hotspot allowed. 3 unlimited plans. Review rating 3.5 out of 5 from 70 customer reviews. How we rank iRoamly.

Japan plans

DataPriceCompare
500 MB
2 days
500 MB a day at full speed, then 256 kbps until the allowance refills, every 24 hours
$0.80
500 MB
3 days
500 MB a day at full speed, then 256 kbps until the allowance refills, every 24 hours
$1.10
500 MB
4 days
500 MB a day at full speed, then 256 kbps until the allowance refills, every 24 hours
$1.50
500 MB
5 days
500 MB a day at full speed, then 256 kbps until the allowance refills, every 24 hours
$1.60
500 MB
6 days
500 MB a day at full speed, then 256 kbps until the allowance refills, every 24 hours
$1.70
500 MB
7 days
500 MB a day at full speed, then 256 kbps until the allowance refills, every 24 hours
$2.00
500 MB
8 days
500 MB a day at full speed, then 256 kbps until the allowance refills, every 24 hours
$2.30
500 MB
9 days
500 MB a day at full speed, then 256 kbps until the allowance refills, every 24 hours
$2.50
500 MB
10 days
500 MB a day at full speed, then 256 kbps until the allowance refills, every 24 hours
$2.80
500 MB
11 days
500 MB a day at full speed, then 256 kbps until the allowance refills, every 24 hours
$3.10
500 MB
12 days
500 MB a day at full speed, then 256 kbps until the allowance refills, every 24 hours
$3.50
500 MB
13 days
500 MB a day at full speed, then 256 kbps until the allowance refills, every 24 hours
$3.60

iRoamly speed and data rules

iRoamly data rules by plan type
Data at full speedWhen it runs outPlans
500 MB a daySlows to 256 kbps until the allowance refills, every 24 hoursMessages, maps and slow web pages, no video16 plans
1 GB a daySlows to 256 kbps until the allowance refills, every 24 hoursMessages, maps and slow web pages, no video10 plans
1 GB a daySlows to 256 kbps until midnight Japan timeMessages, maps and slow web pages, no video10 plans
2 GB a daySlows to 256 kbps until the allowance refills, every 24 hoursMessages, maps and slow web pages, no video5 plans
2 GB a daySlows to 256 kbps until midnight Japan timeMessages, maps and slow web pages, no video5 plans
3 GB a daySlows to 256 kbps until the allowance refills, every 24 hoursMessages, maps and slow web pages, no video4 plans
3 GB a daySlows to 256 kbps until midnight Japan timeMessages, maps and slow web pages, no video4 plans
UnlimitedTop speed 20 MbpsSlows to 5-10 Mbps after a usage limit until midnight Japan timeHD video3 plans
1 to 10 GBiRoamly doesn't say42 plans

iRoamly: “reduced to 5-10 Mbps after the high-speed allowance is used” Source

iRoamly ratings from customer reviews

70 reviews: 66 on Trustpilot and 4 on the App Store, written 8 Apr 2024 to 20 Sept 2026. 3 of them are about a trip to Japan. Each rating needs at least 10 reviews that mention it.

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

iRoamly ratings by aspect
AspectRatingReviews that mention it
Speed2.6 out of 518 reviews
Coverage3.6 out of 542 reviews
Setup4.0 out of 519 reviews
Support3.1 out of 516 reviews
Value4.3 out of 522 reviews
App3.4 out of 510 reviews
Data problems15.7% of reviews11 of 70 reviews report one
Refund problems2.9% of reviews2 of 70 reviews report one

iRoamly speed tests in Japan

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

  • Shiba Park, Tokyo79.1 Mbps
    Upload 5.6 MbpsLatency 38 ms
    Find Your eSIM, Nov 2025
Published speed tests of iRoamly in Japan
WhereDownloadUploadLatencyTested by
Shiba Park, Tokyo79.1 Mbps5.6 Mbps38 msFind Your eSIMNov 2025

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
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

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