
4S eSIM is a new global connectivity brand built by a team with strong experience in the telecommunications industry. Our partners provide direct network access to multiple mobile operators worldwide, giving us first-hand network resources and the ability to offer highly competitive pricing. We aim to make staying connected abroad simple, reliable, and affordable for everyone — from frequent travelers and digital nomads to business professionals and international students. With instant activation, flexible regional and global data plans, and no need for physical SIMs or complex KYC verification, 4S eSIM delivers a truly borderless mobile experience.
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Data plans for this provider are automatically updated. While we strive to keep the information accurate, we cannot guarantee its completeness or accuracy. Please confirm all details on the provider's official website or app before purchasing.
4S eSIM does not provide a truly unlimited data eSIM for Japan. All of its plans marketed as “Unlimited” have a daily data cap – for example Japan Unlimited MAX offers 5GB per day, and Japan Unlimited STANDARD provides 3GB per day – and once the cap is reached the speed is reduced to 1 000 kbps.
Travelers who need more data can choose from fixed‑data plans such as Japan Unlimited MAX 10 days (5GB/day for $34.52) or Japan Unlimited LITE 15 days (2GB/day for $40.99). Because the data allowance is capped, a fixed plan can be more cost effective for heavy users who exceed the daily limit on an “Unlimited” plan.
4S eSIM does not provide a Japan eSIM that includes a phone number or SMS capability. The provider offers only data‑only plans for travelers visiting Japan. However, users can still make calls and send messages using popular VoIP applications such as WhatsApp, Telegram, and iMessage over the data connection.
4S eSIM offers 44 single‑country plans and 160 multi‑country plans for Japan. The data caps on these plans range from 100 MB to 500 GB, with prices spanning from about $1.30 up to $1, 164. The catalogue includes both fixed‑data plans, where a set amount of data is provided for the plan’s validity, and daily‑cap plans that supply a daily data allowance, providing travelers with flexibility to choose the model that best fits their needs.
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