eSIM for Japan

AlpineSIM Japan eSIM

Not enough reviewsGlobal reseller70 plans from $0.29

70 plans on au, Docomo, Rakuten Mobile and SoftBank. 5 GB for a week from US$3.87. Prices checked .

Is AlpineSIM good for Japan?

AlpineSIM runs on au, Docomo, Rakuten Mobile and SoftBank, 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$3.87, the 6th cheapest of the 60 providers with a week plan. Hotspot allowed. 8 unlimited plans, all with no daily cap. How we rank AlpineSIM.

Japan plans

Shown in USD, converted from EUR at ECB rates of

DataPriceCompare
100 MB
7 days
$0.29
500 MB
7 days
$0.57
1 GB
7 days
$0.98
2 GB
15 days
$1.72
3 GB
15 days
$2.44
3 GB
30 days
$2.58
5 GB
30 days
$3.87
10 GB
30 days
$6.72
12 GB
4 days
$6.39
20 GB
30 days
$11.72
21 GB
7 days
$10.90
30 GB
10 days
$16.28

AlpineSIM speed and data rules

AlpineSIM data rules by plan type
Data at full speedWhen it runs outPlans
UnlimitedNo daily cap8 plans
100 MB to 50 GBAlpineSIM doesn't say14 plans
500 MB a dayAlpineSIM doesn't say8 plans
1 GB a dayAlpineSIM doesn't say8 plans
2 GB a dayAlpineSIM doesn't say8 plans
3 GB a dayAlpineSIM doesn't say8 plans
5 GB a dayAlpineSIM doesn't say8 plans
10 GB a dayAlpineSIM doesn't say8 plans

AlpineSIM: “not an unlimited amount at full speed” Source

AlpineSIM reviews and speed tests

No customer reviews or published speed tests of AlpineSIM in Japan yet.

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.