Astaroam eSIM Data Plans for Japan

Astaroam does not provide a true unlimited data eSIM for Japan. All plans listed with the word “Unlimited” actually allocate a fixed daily amount of high‑speed data (for example, 3GB per day) and specify a reduced speed after that limit is reached. Travelers who need more data can choose fixed‑data plans that offer larger bundles, such as the Japan 50GB 30Days (IIJ) plan with 50GB of high‑speed data for 30 days, or the 20GB 30 days plan with 20GB of high‑speed data. These fixed plans can be more cost effective for users who expect to use large amounts of data during their stay.

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.