mysim24 eSIM Data Plans for Japan

mySim24 does not provide a truly unlimited data eSIM for Japan. All plans that carry the “Unlimited” label actually come with data caps ranging from 1 GB to 5 GB per day or per validity period, and once the cap is reached the speed is throttled to either 512 kbps or 2000 kbps.

Travelers can instead choose fixed‑data plans such as the Japan · 50 GB · 30 days plan for $33.56 USD or other high‑data options that offer 1 GB/day up to 5 GB/day over various validity periods. These options provide larger data allowances and avoid the speed reductions that apply to the “Unlimited” plans.

No, mysim24 does not offer any Japan eSIMs that provide a phone number or SMS capability. The provider’s Japan plans are data‑only; a phone number and inbound or outbound voice or SMS services are not included. Travelers who need to make voice calls or send standard SMS can still use VoIP applications such as WhatsApp, Telegram, or iMessage over the data connection, although some destinations may block or restrict particular apps, so it is advisable to confirm that the services you rely on are accessible in Japan before purchasing.

For travelers visiting Japan, mysim24 provides a total of 67 single‑country data plans and 11 multi‑country plans that include Japan in the coverage. The single‑country plans give you the freedom to stay within Japan, while the multi‑country packages are suitable for those who may need connectivity in additional destinations. The available plans span a price range from about $2.84 to $121.75, and data caps range from 1 GB to 50 GB. Some of the plans restrict data usage to a specific daily quota (daily data cap plans), whereas others offer a fixed amount of data that can be used at any time during the validity period (fixed data cap plans).