Before you choose
Four checks for a plan that fits your trip.
Data for the whole trip or per day?
10 GB total is one allowance for the package. 1 GB/day is a daily allowance. Check the reset rules and what happens after the allowance: slower data, extra charges or no connection.
When does validity start?
Installation and activation can be separate steps. Check whether the clock starts at purchase, installation or first connection. Choose enough valid days for your stay.
Where can you connect?
Check every country on your route and the networks listed for the exact package. A country in the coverage list does not guarantee a signal everywhere.
Will it work for your setup?
Check that your phone supports eSIM and is carrier-unlocked. If you need laptop data, verify hotspot permission. Confirm any calls, texts or phone number separately.
Plans to start your comparison
Lowest listed price is the default order. Check data allowances, expiry and device compatibility before buying. We may earn a commission from some links. How we compare · Estimate your data needs
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Select up to 3 plans to compare their data, price and conditions. Your selection stays when you change filters.
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1 days
Unlimited 384kbps after high-speed data is used up.
Unthrottled
This eSIM data package will expire in 180 days from the date of your purchase. Please install and activate it within this period.
Unthrottled
This eSIM data package will expire in 180 days from the date of your purchase. Please install and activate it within this period.
Unlimited 128kbps after high-speed data is used up.
Unlimited 128kbps after high-speed data is used up.
eSim will be activated when first byte of data is consumed
Package: DATA-ONLY
eSim will be activated when first byte of data is consumed
Package: DATA-ONLY
Unlimited 128kbps after high-speed data is used up.
eSim will be activated when first byte of data is consumed
Package: DATA-ONLY
eSim will be activated when first byte of data is consumed
Package: DATA-ONLY
eSim will be activated when first byte of data is consumed
Package: DATA-ONLY
Unthrottled
This eSIM data package will expire in 180 days from the date of your purchase. Please install and activate it within this period.
Catalog: KHM,CHN,HKG,IND,IDN,JPN,KOR,LAO,MAC,MYS,PAK,PHL,SGP,LKA,TWN,THA,VNM | 1GB | 1 day
eSim will be activated when first byte of data is consumed
Package: DATA-ONLY
Unlimited 256kbps after high-speed data is used up.
Choosing an eSIM for your Japan trip
Start with your travel dates and how you use your phone. The cheapest one-day package may suit an arrival day; a two-week trip needs a plan whose validity covers the whole stay.
Match the allowance to your travel days
Compare a whole-trip allowance with another whole-trip allowance. A 1 GB/day package resets by its stated period; a 1 GB total package gives you one shared allowance until it is used or expires. Use our data calculator for a planning estimate, then shortlist two or three plans with enough validity. Hotel Wi-Fi, video calls and laptop use can change your needs.
Read the limit behind unlimited
Saily’s Japan unlimited product currently lists 5 GB per day without a speed limit, followed by data at up to 1 Mbps. This is a provider example, not a rule for every unlimited plan. Check the daily reset, reduced speed and hotspot conditions of the exact package before choosing it for work or streaming.
Install and activate at the right time
Saily describes activation on arrival with its eSIM and roaming enabled. Its regular plans have a 180-day activation window, after which they activate automatically; subscription plans activate on purchase. Other providers may start validity differently. Check your exact device’s eSIM support and carrier lock, and follow the selected provider’s installation instructions over a stable connection.
Check the route, including South Korea
For Tokyo, Kyoto and Osaka, compare the networks listed for Japan. A 5G label in a package name does not prove that its Japan network supports 5G. If your trip continues to South Korea, open full coverage and verify both countries in the same package, or compare separate country plans. A coverage entry does not guarantee a signal at every location.
Provider information checked 10 October 2026 by MyBesteSIM. This is a comparison of published conditions, not a field test. Confirm the selected package at checkout. Our methodology.
Frequently Asked Questions about eSIM for Japan
What is an eSIM and how does it work?
Is my phone compatible with eSIM?
Can I keep my WhatsApp number?
When should I activate my eSIM?
All providers with eSIM plans for Japan
