nextSIM eSIM Data Plans for Japan

nextSIM does not provide a truly unlimited data eSIM for Japan. Plans that include “Unlimited” in the name actually give a fixed amount of high‑speed data—either 1GB or 2GB per day—and after that data the speed is throttled to 512 kbps or 2000 kbps. Because the data allowance is capped, these plans are not unlimited.

For travelers who need larger data volumes, nextSIM offers fixed‑data plans. For example, the eSIM Japan 50GB 30Days Economy plan gives 50GB of high‑speed data for $57.16 USD, and the eSIM 20GB 30 Days Japan plan provides 20GB for $23.03 USD. These larger, flat‑rate plans may be more cost‑effective for heavy data users.

nextSIM does not provide an eSIM for Japan that includes a phone number or SMS service. The provider only offers data‑only plans for travelers in Japan. Users who need voice or text communication can rely on VoIP and messaging applications such as WhatsApp, Telegram, or iMessage, which work over the data connection.

nextSIM lists 29 single‑country plans and 21 multi‑country plans that include Japan. The plans come in two main styles: fixed data caps, offering a set amount of data for the whole validity period, and daily data cap options that reset each day. Across both categories the price spectrum ranges from approximately $2.84 to $1, 264.60, while the data caps vary from 1 GB to 50 GB for validity periods between one and thirty days.