AdventureSIMs eSIM Data Plans for Japan

AdventureSIMs does not provide any unlimited data eSIM for Japan. The provider’s available plans for Japan are fixed data plans with caps such as 50GB for 30 days or 180 days, 20GB for 30 days, 10GB for 30 days, and 5GB for 30 days. For travelers who need more data, the 50GB options offer a larger allocation and may be more cost‑effective than purchasing a heavier plan from another vendor, unless the user is an extremely heavy data consumer who would benefit from a truly unlimited plan.

AdventureSIMs does not provide any Japan eSIM that includes a phone number or SMS capability. The service only offers data‑only plans for travelers in Japan. Users who need to communicate over voice or text can use VoIP applications such as WhatsApp, Telegram, or iMessage, which operate over the data connection provided by the eSIM.

AdventureSIMs offers nine data plans that cover Japan exclusively. All of these plans are single‑country offerings; there are no multi‑country options available through the provider. The catalog of Japan plans varies from $1.20 up to $36.29, with data caps ranging from 1 GB up to 50 GB. Validity periods span from 1 to 180 days, allowing travelers to choose short‑term or longer‑term coverage. Each plan is a fixed‑data‑cap structure, meaning you receive a set amount of data that can be used at your leisure without a daily limit, and many of the plans allow tethering so that the data can be shared across multiple devices.