nextSIM eSIM Data Plans for Japan

nextSIM does not provide a truly unlimited high‑speed data eSIM for Japan.
Its plans that carry the word “Unlimited” actually give a fixed allowance of 1 GB or 2 GB per day and switch to a reduced speed once that limit is reached.

Travelers who need more data can choose from nextSIM’s fixed data plans, such as the eSIM Japan 50GB 30Days Economy or eSIM Pro Japan 50GB 30Days Mobile Data + SMS Number. These plans offer larger data allowances without the speed throttling that follows the “Unlimited” plan limits.

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 offers 74 single‑country plans and 28 multi‑country plans for Japan. The catalogue includes both fixed‑data plans—84 in total—and daily‑cap plans—18 in total—providing variety for travelers who need specific usage limits. Prices range from $2.80 to $1, 295.03, while data caps span 1 GB up to 50 GB, and validity periods extend from 1 day to 365 days.