Roamify eSIM Data Plans for Japan

Roamify offers unlimited data eSIM plans for Japan with validity periods ranging from 1 day up to 30 days. Prices start at $3.00 USD for a 1‑day plan and reach $50.00 USD for a 30‑day plan, covering the full range of available durations. Each plan includes tethering, supports 4G, 5G and LTE networks, and is marked as unlimited, though the description notes that “speed may be throttled” after heavy usage.

The unlimited designation is subject to a fair‑usage policy. After a certain amount of data, speeds may be reduced, so travelers who need consistent high speed should contact Roamify directly to confirm whether a fair‑usage policy applies and to learn the typical threshold at which throttling occurs.

Roamify offers several eSIM plans that include a phone number and SMS capability for use in Japan. The plans range in price from $15.00 USD for a 1GB, 7‑day package to $105.00 USD for a 20GB, 365‑day package, with validity periods available from 7 days up to 365 days. Phone numbers on these plans are provided with the dialing code +1 (United States) for the Global Premium series, or +33 (France) for the Asia Sprint plan, so they are not local Japanese numbers. All listed packages allow inbound and outbound voice calls as well as inbound and outbound SMS messages. Travelers who need specific functionality or confirmation of number type should contact Roamify directly.

For travelers heading to Japan, Roamify currently lists 37 single‑country data plans and 86 multi‑country plans that cover Japan. The available options span a price range from about $3 up to $160 and provide data caps between 1 GB and unlimited, with some plans offering a fixed data amount and others setting a daily data cap. Tethering is allowed on many of these plans, though speeds may be throttled in certain circumstances.