Osaka eSIM: Data from your first connection
Your Osaka eSIM carries data and nothing else, so treat it as a second line on the phone. Install it over Wi-Fi at home, well before the flight into Kansai International Airport. The plan's days start at your first connection in Japan, rather than at checkout. Softbank and KDDI carry the signal from the moment you land at the airport.
13 plans for Japan, from 500 MB at $1.99 to 20 GB at $21.99, plus 6 unlimited-data tiers. 5 GB for 30 days costs $9.99 — 6th cheapest of 29 in Asia, against a $10.99 median. Our retail prices from the operator catalogue, checked 13 September 2026.
Japan · KDDI 5G · from $1.99
Last eSIM issued 1 day ago
Landing at Kansai International Airport
Nothing happens until you switch data roaming on for the eSIM line yourself. A travel profile never flips that switch on its own. Open the mobile data setting after landing and pick the eSIM as the line carrying data. The first-usage clock starts there, so every day of the plan runs from that moment onward. Buying the profile weeks ahead of the trip therefore costs you none of those days. On Android, wbdata is the value to type into the APN field, while an iPhone needs nothing.
Which plan for Osaka
Trip length decides this well before the size of the data allowance does. The Japan ladder ran from 500 MB over seven days up to 20 GB over thirty, checked 5 September 2026. Unlimited passes cover three days at the short end and thirty days at the long one. Airalo listed the 5 GB thirty-day plan at $9.99 on 5 September 2026. The three-day unlimited pass stood at $11.49 on the same date. A week of sightseeing and a month of remote work sit at opposite ends of that ladder. One profile covers all of Japan, Okinawa and Hokkaido included, so a side trip needs no second purchase.
What Japanese law asks of you
Japan asks nothing of a visitor who arrives carrying a data profile like this one. The Japan country page found no confirmed trap for an eSIM of this kind. Act No. 31 of 2005 has identity verified before a voice line is sold to anyone. That check sits with the carrier selling the line, and you are buying no voice line here. You buy a roaming profile instead, and no local registration stands in the way.
Softbank or KDDI, picked by hand
Two Japanese networks carry this profile, and the phone settles on one. Softbank and KDDI are both listed as 5G on the Japan entry. A handset left searching can be pointed at the other by name. Network selection sits in the same settings screen as the line. The plan does not change with the network, and neither does the day count. Both are partner networks for the one roaming profile, checked 5 September 2026.
Before you fly to Osaka
- The Japanese day count opens at the first Kansai connection, not at purchase.
- Act No. 31 of 2005 checks identity before a voice line is sold.
- Unlimited passes in Japan run from three days up to a full thirty.
The country page has the full rule and every plan: Japan eSIM.