RedSim eSIM Data Plans for Japan

RedSim does not provide a truly unlimited data eSIM for Japan. The plans labeled “Japan Unlimited” give high‑speed data up to 3GB per day; after that limit the speed drops to 1 Mbps, so the data is not unlimited.

Travelers who need a larger, fixed amount of high‑speed data can choose RedSim’s fixed data plans, such as the Japan 50GB 30 days plan for $33.50 USD or the Japan 20GB 30 days plan for $21.95 USD. These plans offer a set data allowance that must be used within 30 days and can be more cost‑effective for most users.

RedSim does not provide Japan eSIMs that include a phone number or SMS capability. All available plans from RedSim for Japan are data‑only. Travelers can use VoIP apps such as WhatsApp, Telegram, and iMessage over the data connection, but some destinations may block or restrict specific apps or VoIP services, so users should verify that the apps they rely on are accessible in Japan before purchasing.

RedSim provides 17 single‑country data plans and 17 multi‑country data plans for Japan. The plans cover a price range from about $1.93 to $63.80 and offer data caps between 1 GB and 50 GB. Some of the options are fixed‑data plans that give a set amount of data for the entire validity period, while others are daily‑data‑cap plans that reset the data allowance each day.