nextSIM eSIM Data Plans for Japan

nextSIM does not provide a plan that offers truly unlimited high‑speed data in Japan. The several plans that use the word “Unlimited” in their names actually include fixed data caps of 1 GB or 2 GB per day, and after that amount is used the speed is throttled to 512 kbps or 2 000 kbps.

For travelers who need larger amounts of data, nextSIM offers fixed data plans such as the eSIM Pro Japan 50GB 30Days Mobile Data + SMS Number, which includes 50 GB of high‑speed 5G data for 30 days, or the eSIM Japan 20GB 30Days Standard, which provides 20 GB for the same period. These fixed data plans can be a cost‑effective alternative for users who consume more than a few gigabytes.

NextSIM does not offer an eSIM with a phone number or SMS for Japan; their eSIM plans there are data‑only.

Because there is no phone number or SMS capability, travelers can rely on VoIP applications such as WhatsApp, Telegram, or iMessage for voice and text over the data connection. However, some destinations restrict or block access to particular apps or VoIP services, so users should confirm that the applications they need are functional in Japan before purchasing a plan.

nextSIM provides a broad selection of data plans for travelers to Japan. The directory lists 68 single‑country plans that are specifically tailored for use in Japan, and 38 multi‑country plans that cover Japan in addition to other destinations. These plans cover data caps from 1 GB up to 50 GB and are priced between roughly $2.70 and $1, 278.17, with validity periods ranging from a single day to a full year. The single‑country options give a fixed amount of data for a set number of days, while the multi‑country options bundle Japan with additional countries in a single subscription, offering more flexibility for extended travel itineraries.