nextSIM eSIM Data Plans for Japan

NextSIM does not provide a genuinely unlimited data plan for Japan. The plans that include “Unlimited” in their name are actually limited to a fixed amount of high‑speed data per day; once that limit is reached, the speed is throttled (for example, 1 GB/day with a reduced speed of 512 kbps or 2 GB/day with a reduced speed of 2000 kbps). If you need more data, a fixed‑cap plan such as the eSIM Japan 20GB 30Days Standard, which offers 20 GB of high‑speed data for 30 days, may be a more suitable and cost‑effective option. The “Unlimited”‑named plans can be useful for short stays or lower‑bandwidth usage, but for heavy data consumption a larger‑cap plan is preferable.

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 68 single‑country plans and 28 multi‑country plans for Japan. The available plans span a price range from about $2.71 to $1, 268.60 and a data cap range from 1 GB to 50 GB. Some plans are fixed data‑cap offerings, while others impose a daily data limit; the differing structures allow users to choose between a single, predetermined data allocation or a daily‑cap that refreshes with each day of validity.