Question 1

Is this really unlimited?

Accepted Answer

Yes. The Japan eSIM is truly unlimited for mobile data during your selected 7, 15 or 31 day plan. There are no daily data caps and no throttling from BambooSIM.

Question 2

Is there a fair use policy?

Accepted Answer

No daily fair use cap applies to normal mobile data use. Speeds can still vary by local coverage, congestion, building materials and your device, but BambooSIM does not slow you after a daily allowance.

Question 3

Can I use hotspot/tethering?

Accepted Answer

Yes. Each plan includes bonus hotspot equal to the plan length minus 1GB: 6GB on 7 days, 14GB on 15 days and 30GB on 31 days. Your regular phone data remains unlimited.

Question 4

What network does it use in Japan?

Accepted Answer

It uses the KDDI/au network in Japan, one of the major local networks used across the country.

Question 5

Can I use it across Tokyo, Osaka, Kyoto, Hokkaido and Okinawa?

Accepted Answer

Yes. It is designed for travel across Japan, including Tokyo, Osaka, Kyoto, Hokkaido and Okinawa. Coverage depends on the local KDDI/au signal in each exact location.

Question 6

Does it work immediately when I land?

Accepted Answer

Yes. After installation, it automatically activates when you land in Japan and connect to the supported local network. Turn the eSIM on for mobile data after arrival.

Question 7

Can I install before I travel?

Accepted Answer

Yes, and we recommend it. Install the eSIM any time before travelling while you have internet access, because your phone needs a connection to download the eSIM profile.

Question 8

What happens if I install too early?

Accepted Answer

Installing early will not start the plan. Activation is automatic only when the eSIM connects to the network in Japan, so it will not activate early while you are still outside Japan.

Question 9

How quickly will I receive the eSIM?

Accepted Answer

Your eSIM normally arrives within a few minutes of ordering. The QR code and installation details are shown after checkout and sent to your email address.

Question 10

How long do I have to activate it?

Accepted Answer

The eSIM is valid for 180 days from purchase. That gives you the full window to activate and use the plan, so you can buy before your trip without rushing.

Question 11

Does it include calls or SMS?

Accepted Answer

No. This is a data-only eSIM. Keep your existing number active for calls or SMS if needed, and use data apps like WhatsApp, iMessage, LINE, Maps and email.

Question 12

Is this better than pocket WiFi?

Accepted Answer

For most travellers, yes. There is no separate device to collect, charge, return or carry. Your phone connects directly to the local KDDI/au network.

Question 13

Do I need to check device compatibility?

Accepted Answer

Yes. Your device must be unlocked and eSIM-compatible. Please use the device checker or dial *#06# and look for an EID before placing your order.

Question 14

Can I get a refund after ordering?

Accepted Answer

Japan Unlimited eSIMs are non-refundable, including duplicate orders. Please check your travel dates, selected plan and device compatibility before checkout.

Question 15

Is support available during my trip?

Accepted Answer

Yes. BambooSIM support is available 24/7 through the support center and live chat options shown on the site.

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