nextSIM eSIM Data Plans for Japan

NextSIM does not provide a truly unlimited high‑speed eSIM for Japan. Plans that use the word “Unlimited” actually offer a fixed amount of high‑speed data that is capped, after which the speed is throttled. For example, the eSIM Japan Unlimited 3Days Standard plan gives 1GB of high‑speed data each day for 3 days and the speed is reduced to 512kbps once the daily quota is reached. Similarly, the eSIM Japan Unlimited Plus 5Days Standard plan offers 2GB of high‑speed data each day for 5 days with a reduced speed of 2000kbps after the limit is hit.

If a traveler needs more data without having the speed drop, nextSIM provides fixed‑data plans such as the eSIM Japan 50GB 30Days Economy and eSIM Pro Japan 50GB 30Days Mobile Data + SMS Number, each delivering 50GB of high‑speed data for 30 days without any throttling.

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.