Astaroam eSIM Data Plans for Japan

Astaroam does not provide a truly unlimited high‑speed data plan for Japan. The packages branded as “Japan Unlimited Data” give 3 GB per day and reduce speed to 512 kbps after the daily allowance is reached, so they are not unlimited in the usual sense.

Fixed‑cap options are available instead. For example, a Japan 20GB 30Days plan costs $17.61 USD and a Japan 10GB 30Days plan costs $12.39 USD; both include 5G coverage, tethering, and 30‑day validity. Choosing one of these fixed data plans can be more cost‑effective for most travelers unless they require very heavy data usage.

Astaroam does not offer any eSIM plan for Japan that includes a phone number or SMS capability. Only data‑only eSIMs are available from this provider for Japan. Travelers can still use VoIP applications such as WhatsApp, Telegram, or iMessage over the data connection to make calls and send messages.

Astaroam offers six single‑country plans and twelve multi‑country plans for Japan, giving travelers a range of choices. The plans cover a price range from about $4.88 to $51.97 and a data cap range of 1 GB to 20 GB, with validity periods from seven to thirty days. In addition to the total data‑limit plans, Astaroam provides two daily‑cap plans that deliver a fixed amount of data each day and sixteen fixed‑cap plans that deliver a set amount of data for the entire validity period.