MobileSIM eSIM Data Plans for Japan

MobileSIM does not provide a truly unlimited high‑speed data eSIM for Japan. The plans that include “Unlimited” in their name actually offer 3 GB per day, after which the speed is reduced to 1000 kbps. For travelers who need more data without daily caps, MobileSIM sells fixed‑data plans. Examples include Japan 20 GB for 30 days at $25.00 USD and Asia 100 GB for 180 days at $185.00 USD. Choosing one of these fixed‑data plans can be more cost‑effective for users who consume large amounts 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 plans and 15 multi‑country plans that cover Japan, giving customers 27 different options when traveling in the country. The plans vary from as little as 200 MB of data for a few days to up to 100 GB that can be used for a full year, with prices ranging from about $1.50 to $185. Some plans offer a fixed data amount—available for all validity periods—while others provide a daily data cap, giving flexibility for short‑term stays.