MobileSIM eSIM Data Plans for Japan

MobileSIM does not provide truly unlimited high‑speed data plans for Japan. The plans titled “Japan Unlimited” grant 3 GB each day for up to 30 days, after which the speed is reduced to 1000 kbps. For travelers who need consistent high‑speed coverage, fixed‑data options such as the Japan 20 GB for 30 days plan priced at $25 or the Asia 100 GB for 180 days plan, which cover Japan, can be more cost‑effective and avoid speed throttling.

MobileSIM does not offer an eSIM plan for Japan that includes a phone number or SMS capability. Travelers who need a phone number or SMS will need to use a data‑only plan and can rely on VoIP applications such as WhatsApp, Telegram, or iMessage over the data connection. Some destinations may block or restrict specific VoIP services, so it is advisable to verify that the apps you plan to use are accessible in Japan before purchasing a MobileSIM plan.

MobileSIM offers 12 single‑country (Japan‑only) plans and 22 multi‑country plans that include Japan. The plans are priced between $2.34 and $89 and provide data from 200 MB up to 100 GB over 3 to 180 days. Plans are split into daily data‑cap options, which limit the amount of data you can use each day, and fixed data‑cap options, which allocate a set amount of data for the entire validity period.