ZenSim eSIM Data Plans for Japan

ZenSim does not provide a truly unlimited data eSIM for Japan. The plans named Japan Unlimited give a daily cap of 3GB; after reaching that limit the speed would drop, so the plan is not unlimited in the sense of unlimited high‑speed data.

Instead, ZenSim offers fixed‑data options that can be more cost effective for most travelers. Examples include the 20GB plan valid for 30 days, priced at $35.00 USD, and the 10GB plan valid for 30 days, priced at $21.00 USD. These plans provide a large data allowance and may suit users who do not need unlimited data but still want substantial connectivity.

ZenSim does not provide eSIM plans that include a phone number or SMS capability for Japan. The provider only offers data‑only eSIMs in that country. Travelers can still use VoIP applications such as WhatsApp, Telegram, and iMessage over the data connection for calls and messaging.

ZenSim offers eight single‑country data plans for Japan and no multi‑country plans. Among these, two plans use a daily data cap, meaning the data allotment is reset each day, while the remaining six provide a fixed data limit that lasts for the entire validity period. Prices vary from $13 to $66, with data allowances ranging from 3 GB up to 20 GB. Tethering is permitted on the plans that list this feature.