Astaroam eSIM Data Plans for Japan

Astaroam does not provide a genuinely unlimited high‑speed data plan for Japan. The plans titled “Japan Unlimited Data 5Days, ” “Japan Unlimited Data 7Days, ” “Japan Unlimited Data 10Days, ” and “Japan Unlimited Data 15Days” are capped at 2GB per day; once the daily limit is reached the speed drops to 512kbps.

If you need a larger data allowance without daily limits, Astaroam also offers fixed‑data plans such as 20GB for 30 days or 10GB for 30 days, both including 5G coverage in Japan. These can be more cost effective for travelers who require more than a few gigabytes of data.

Astaroam does not offer an eSIM for Japan that includes a phone number or SMS capability. The provider only supplies data‑only plans for that destination.

Travelers who need to make voice or text communications can use VoIP applications such as WhatsApp, Telegram, or iMessage over the data connection. Some destinations may restrict or block access to particular apps or VoIP services, so travelers should check that the services they rely on are available in Japan before purchasing an Astaroam eSIM.

Astaroam presents 4 single country data plans specific to Japan and 12 multi country options that include Japan among their coverage areas. These plans come in two designations: daily data cap plans, which limit usage to a set amount each day (four such plans available), and fixed data cap plans that provide a total data allotment over the validity period (twelve such plans). Prices range from roughly $4.88 to $51.94, while data caps span from 1 GB to 20 GB and validity periods run between 5 and 30 days.