eSIM for Japan

Billion Connect Japan eSIM

3.9 out of 5 review rating, from(106 reviews)Global reseller100 plans from $1.30

100 plans on SoftBank and Docomo. 5 GB for a week from US$3.80. Prices checked .

Is Billion Connect good for Japan?

Billion Connect runs on SoftBank and Docomo, 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$3.80, the 5th cheapest of the 60 providers with a week plan. 5G on some plans. Review rating 3.9 out of 5 from 106 customer reviews. How we rank Billion Connect.

Japan plans

DataPriceCompare
1 GB
3 days
1 GB at full speed, then 256 kbps for the rest of the plan
$2.00
1 GB
3 days
1 GB at full speed, then 384 kbps for the rest of the plan
$2.10
1 GB
3 days
1 GB at full speed, then 384 kbps for the rest of the plan
$2.49
1 GB
3 days
1 GB at full speed, then 128 kbps for the rest of the plan
$8.61
1 GB
3 days
1 GB at full speed, then 128 kbps for the rest of the plan
$12.40
3 GB
5 days
3 GB at full speed, then 256 kbps for the rest of the plan
$3.00
3 GB
7 days
3 GB at full speed, then 384 kbps for the rest of the plan
$3.90
5 GB
7 days
5 GB at full speed, then 256 kbps for the rest of the plan
$3.80
5 GB
7 days
$4.40
5 GB
7 days
5 GB at full speed, then 384 kbps for the rest of the plan
$4.99
5 GB
7 days
5 GB at full speed, then 384 kbps for the rest of the plan
$5.30
5 GB
7 days
5 GB at full speed, then 128 kbps for the rest of the plan
$6.90

Billion Connect speed and data rules

Billion Connect data rules by plan type
Data at full speedWhen it runs outPlans
1 GB a daySlows to 128 kbps for the rest of the dayMessages and maps only30 plans
1 GB a daySlows to 384 kbps for the rest of the dayMessages, maps and slow web pages, no video20 plans
2 GB a daySlows to 128 kbps for the rest of the dayMessages and maps only17 plans
2 GB a daySlows to 384 kbps for the rest of the dayMessages, maps and slow web pages, no video12 plans
1 to 20 GBSlows to 384 kbps for the rest of the planMessages, maps and slow web pages, no video8 plans
1 to 30 GBSlows to 256 kbps for the rest of the planMessages, maps and slow web pages, no video6 plans
1 to 10 GBSlows to 128 kbps for the rest of the planMessages and maps only4 plans
5 to 15 GBBillion Connect doesn't say3 plans

Billion Connect: “your connection speed will be reduced for the remainder of the day.” Source

Billion Connect ratings from customer reviews

106 reviews: 44 on Google Play, 37 on the App Store and 25 on Trustpilot, written 4 Sept 2020 to 31 Oct 2026. 4 of them are about a trip to Japan. Each rating needs at least 10 reviews that mention it.

Review rating3.9 out of 5The mean of the ratings below

Billion Connect ratings by aspect
AspectRatingReviews that mention it
Speed3.7 out of 533 reviews
Coverage4.0 out of 545 reviews
Setup4.1 out of 535 reviews
Support3.5 out of 515 reviews
Value4.3 out of 539 reviews
App3.9 out of 524 reviews
Data problems6.6% of reviews7 of 106 reviews report one
Refund problems0.9% of reviews1 of 106 reviews reports one

Billion Connect speed tests in Japan

No published speed tests of Billion Connect 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.

  • NTT Docomo
    Download
    50.5 MbpsQ3 2025
    Time on 5G
    51.4%
  • 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
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.