Astaroam eSIM Data Plans for Japan

Astaroam does not offer a truly unlimited data eSIM plan for Japan. The plans that include “Unlimited” in their name actually provide a fixed daily high‑speed allowance of 3 GB per day across 7 or 10 days; once that limit is reached the speed drops to 512 kbps.

Travelers who need more data can choose one of Astaroam’s fixed‑data options. For example, the Japan 20GB 30Days plan delivers 20 GB of high‑speed data for 30 days at about $24.08 USD, while the Japan 10GB 30Days plan offers 10 GB for the same period at roughly $14.72 USD. These alternatives can be more economical for most users unless extremely heavy data consumption is expected.

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 data plans and twelve multi‑country plans that include Japan. The plans cover a price range of $4.94 to $86.61, data caps from 1 GB to 20 GB, and validity periods between 7 and 30 days. Within these options there are two daily‑data‑cap plans that provide a fixed amount of data each day, and sixteen fixed‑data‑cap plans that provide a total data allotment for the entire validity period. Accordingly, a total of fourteen distinct types of data plans are available for Japan, split between single‑country and multi‑country offerings.