MobileSIM eSIM Data Plans for Japan

MobileSIM does not provide any truly unlimited data eSIM for Japan. The plans labeled “Japan Unlimited data” all contain a daily cap of 3 GB, and after the daily limit is reached the speed is reduced to 1000 kbps, which is why the plans carry the “hasUnlimitedName” flag.

Travelers who need higher data allowances can choose from fixed‑data plans such as Japan 20 GB for 30 days priced at $25 USD, or larger regional packages like Asia 100 GB for 180 days at $185 USD. These plans provide a larger total data volume and do not impose a daily cap, which can be more cost‑effective unless a user requires constant maximum‑speed connectivity.

MobileSIM does not provide an eSIM plan for Japan that includes a local phone number or SMS capability. The provider offers only data‑only eSIMs for travelers in Japan. Travelers who need voice or text communication can rely on internet‑based VoIP applications such as WhatsApp, Telegram, and iMessage, which work over the data connection without requiring a traditional phone number or SMS service.

MobileSIM offers 12 single‑country data plans and 15 multi‑country data plans for Japan. These plans provide data caps ranging from 200 MB to 100 GB and are priced between $1.50 and $185.00. Among them, 6 plans feature a daily data cap while 21 offer a fixed data amount for the full validity period. The daily data cap plans give a set amount of data for each day of validity, whereas the fixed data plans provide a single total data allocation for the entire validity duration.