Seven days is a common length of a self-sufficient trip to Japan. The frequently asked question is not "which package is cheap", but "how many GB to buy to fit, not lacking in the middle of the road but not too much". This article helps you choose in two clear steps.
Many people look at the GB number first and then consider it, but the expiration date is the hard constraint. A package with a lot of data but a term shorter than the number of travel days will still not use the entire trip.
After filtering by expiration date, it's time for data — and this is where many people buy excess. According to actual data from thousands of Japanese eSIM orders of the same package type, most customers use much less than imagined: on average only about 0.5 GB per day, half of customers use less than ~0.45 GB/day.
| Number of travel days | Most use it all (median → average) | Contributed every day |
|---|---|---|
| 5 days | ~2.3 → 3.1 GB | ~0.5 GB/day |
| 7 days | ~2.8 → 3.7 GB | ~0.5 GB/day |
| 10 days | ~4.4 → 5.1 GB | ~0.5 GB/day |
In other words, the 1GB/day package (≈7GB for a 7-day trip) is more than enough for most people; 2GB/day package is very comfortable. In reality, customers only use about a quarter to a third of their high-speed limit — so don't rush into buying a big package.
If you are not sure which group you belong to, see the calculation in the article how many GB of data are needed when going to Japan.
Tip: Choosing a package that's just enough and then buying more when needed is more flexible than buying a package that's too big from the start. You can always refill if it goes faster than expected.
For 7-day trips, filter packages that are valid for 7 days or more first, then choose capacity according to how you use the network. On the page shibaSIM's Japanese eSIM plan there is a suggestion tool available: you enter the number of days and describe usage, the system will estimate GB and suggest a package that covers both data and expiration date. Price listed in VND, payment by VietQR transfer, receive QR code immediately after payment.
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