Astaroam eSIM Data Plans for Japan

Astaroam does not provide truly unlimited data plans for Japan. The plans listed under the “Unlimited” name give a daily data allowance—3GB per day or 2GB per day—and, once that limit is reached, the speed drops to 1000 kbps or 512 kbps, respectively. Thus, while the name implies unlimited usage, the high‑speed bandwidth is capped.

For travelers who need a larger pool of data, Astaroam offers fixed‑data plans. Examples include the Japan 50GB 30Days (IIJ) plan, which supplies 50GB of data for 30 days, and the Japan 20GB 30Days (IIJ) plan, which gives 20GB for the same period. These fixed plans can be more cost‑effective for users who require a substantial amount of data without the speed reduction that occurs under the “Unlimited” offerings.

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 lists 17 single‑country plans and 26 multi‑country plans that cover Japan. The available prices range from about $1.99 to $48.75, with data caps spanning from 500 MB up to 50 GB and validity periods of 3 to 90 days. Plans are offered in two styles: daily data‑cap options that reset each day and fixed‑cap options that provide a lump sum for the entire validity. This summary gives a general view of the range of plans currently available for travelers to Japan.