eSIM for Japan

aloSIM Japan eSIM

3.6 out of 5 review rating, from(496 reviews)Global reseller30 plans from $3.50

30 plans on au. 5 GB for a week from US$9.50. Prices checked .

Is aloSIM good for Japan?

aloSIM runs on 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$9.50, the 22nd cheapest of the 60 providers with a week plan. 6 unlimited plans. Review rating 3.6 out of 5 from 496 customer reviews. How we rank aloSIM.

Japan plans

DataPriceCompare
1 GB
1 day
1 GB at full speed, then data stops
$3.50
1 GB
3 days
1 GB at full speed, then data stops
$4.00
1 GB
5 days
1 GB at full speed, then data stops
$4.50
1 GB
7 days
1 GB at full speed, then data stops
$4.50
3 GB
1 day
3 GB at full speed, then data stops
$4.50
3 GB
30 days
3 GB at full speed, then data stops
$8.00
5 GB
3 days
5 GB at full speed, then data stops
$7.00
5 GB
5 days
5 GB at full speed, then data stops
$7.00
5 GB
7 days
5 GB at full speed, then data stops
$9.50
5 GB
10 days
5 GB at full speed, then data stops
$10.00
5 GB
15 days
5 GB at full speed, then data stops
$10.50
5 GB
30 days
5 GB at full speed, then data stops
$11.00

aloSIM speed and data rules

aloSIM data rules by plan type
Data at full speedWhen it runs outPlans
1 to 50 GBData stops24 plans
UnlimitedSlows to 512 kbps after a usage limitMessages, maps and slow web pages, no video6 plans

aloSIM: “the speed of your Data will be reduced to 512 KBPS” Source

aloSIM ratings from customer reviews

496 reviews: 203 on the App Store, 184 on Google Play and 109 on Trustpilot, written 17 Apr 2023 to 13 Nov 2026. 32 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

aloSIM ratings by aspect
AspectRatingReviews that mention it
Speed3.1 out of 526 reviews
Coverage3.4 out of 5188 reviews
Setup3.4 out of 5214 reviews
Support4.3 out of 5231 reviews
Value3.6 out of 586 reviews
App3.7 out of 577 reviews
Data problems2.6% of reviews13 of 496 reviews report one
Refund problems2.2% of reviews11 of 496 reviews report one

On trips to Japan: coverage 3.4 from 25 reviews and setup 3.5 from 14 reviews.

aloSIM speed tests in Japan

No published speed tests of aloSIM in Japan.

How fast this network is 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%
Ookla speeds for each network's own customers
NetworkDownload5G downloadTime on 5GLatency
KDDI (au)67.85 MbpsNot published48.8%Not published

Sources: Ookla Speedtest Connectivity Report H1 2026 via TelecomLead, 17 Sept 2026.