nextSIM eSIM Data Plans for Japan

nextSIM does not provide a true unlimited data eSIM for Japan. All plans labeled “Unlimited” in the nextSIM catalog give a specific data allowance—either 1 GB or 2 GB per day or for the whole validity period—and after that amount the connection speed is throttled (to 512 kbps for standard plans or 2000 kbps for the Plus variants).

Instead, nextSIM offers fixed‑data plans that can be more suitable for heavy usage, such as the eSIM Japan 50GB 30Days Economy plan, which supplies 50 GB of high‑speed data for 30 days, or the eSIM Pro Japan 50GB 30Days Mobile Data + SMS Number plan, which also delivers 50 GB. These larger‑data options may prove more cost effective for travelers who need substantial bandwidth without the speed reductions that come after a capped “Unlimited” plan.

nextSIM does not provide an eSIM plan with a local phone number or SMS capability for Japan.
Only data‑only eSIMs are offered, which allow internet access on 4G or 5G networks.
Travelers can still use VoIP applications such as WhatsApp, Telegram, or iMessage over the data connection to make calls and send messages.

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.