Simbye eSIM Data Plans for Japan

Simbye does not provide a genuinely unlimited high‑speed data eSIM for Japan. The plans labelled “Japan Unlimited” deliver 2GB of data per day; after that amount is used the speed is throttled to 1000 kbps. Thus high‑speed Internet is limited on all of Simbye’s so‑called unlimited plans.

Instead of unlimited data, Simbye offers fixed‑data releases that can be more suitable for travelers who need larger totals. For instance, Japan 50GB 180Days gives 50GB for 180 days, and Japan 20GB 30Days offers 20GB for 30 days. These plans run without a daily cap, making them a common alternative to the capped “Unlimited” selections.

Simbye does not provide Japan eSIM plans that include a phone number or SMS capability; only data‑only plans are available. Travelers can use VoIP applications such as WhatsApp, Telegram or iMessage over the data connection, but some destinations may block or restrict specific apps, so it is advisable to verify that the apps a traveler relies on are accessible in Japan before purchasing a Simbye eSIM.

Simbye offers nine single‑country plans that cover Japan as well as five multi‑country plans in which Japan is included. The plans range in price from about $3.00 to $70.00 and provide data caps between 1 GB and 50 GB, with validity periods from 7 to 180 days. Some plans allow tethering and, if the data limit is exceeded, a reduced speed of 1000 kbit/s applies.