MobiMatter eSIM Data Plans for Japan

MobiMatter does not provide a truly unlimited data eSIM for Japan; all of its advertised “Unlimited” plans actually give fixed high‑speed data allowances ranging from 28 GB to 66 GB for periods of 3 to 10 days. These plans allow tethering, and after the set amount of high‑speed data is used the speed may be throttled, but the data limit remains.

If unlimited data is required, travelers can choose one of MobiMatter’s fixed data plans instead. For example, the Japan 60 GB plan is valid for 90 days at $45.99 USD, and the Japan 50 GB plan is valid for 30 days at $29.99 USD. These larger data packages provide a cost‑effective alternative for most users who need more data than the short‑term “Unlimited” plans.

MobiMatter does not offer a Japan eSIM that includes a local phone number or SMS capability. The provider’s Japan plans are data‑only, so travelers who require a physical phone number must use other services. Calls and messaging can instead be carried out through VoIP applications such as WhatsApp, Telegram, or iMessage over the data connection.

MobiMatter provides 27 single‑country data plans that cover Japan, and it also offers 36 multi‑country plans that include Japan. Prices for these packages range from about $3.99 to $74.99, while data caps fall between 1 GB and roughly 66 GB. The single‑country plans feature a fixed data allocation for the chosen validity period, whereas the multi‑country packages allow the same data to be used across several destinations, offering greater flexibility for travelers.