MobileSIM eSIM Data Plans for Japan

MobileSIM does not offer a truly unlimited data eSIM for Japan; all of its so‑called “Unlimited” plans provide a fixed high‑speed allowance of 3GB per day and after that limit the speed drops to 1000kbps. If you need higher data usage without throttling, consider one of MobileSIM’s fixed data plans. For example, an Asia 100GB plan is valid for 180 days, and a Japan 20GB plan is available for 30 days. These fixed‑data options can be more cost‑effective for travelers who consume a large amount of data.

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 lists 12 single‑country data plans for Japan and 13 multi‑country plans that include Japan among their coverage. The catalogue includes both daily data cap options and fixed data amount plans, giving travelers flexibility in how they spend data during their trip. Prices across the portfolio range from roughly $4.00 to $185.00, while the data limits vary from 1 GB up to 100 GB, allowing users to choose a plan that best matches their expected usage.