Alternative

A Jetpac alternative for Japan

Disclosure: ESIM KIMONO is our store. Competitor facts come from their own pages and public reviews, checked 13 October 2026, each linked.

Short answer: Jetpac suits light users well. Its Japan unlimited runs at normal speed for the first 3GB every 24 hours, then up to 1 Mbps until the cycle resets (Jetpac Japan page). If you video call, upload or hotspot, that 3GB can be gone by lunch. ESIM KIMONO runs on KDDI at a flat 10 Mbps all day, with no daily data cap.

What does a 1 Mbps afternoon in Tokyo feel like?

It is 2 pm in Shibuya. Since breakfast you have video called home, posted the morning at Meiji Jingu, and backed up a few hundred photos. Now the family wants ramen near Ebisu, and the map is crawling.

Your partner opens a taxi app. It spins. At the ramen shop the ticket machine takes QR payment, and the payment app is waiting for data. The kids are hungry and you are standing at the till, refreshing.

Nothing is broken. You have simply passed 3GB for the day, and your plan has moved to its slower speed until the cycle resets.

What you wanted was a known carrier, a speed rule you could read before paying, a human who answers, and a replacement if the eSIM fails. That is the lens for this page.

How do Jetpac's and ESIM KIMONO's speed rules differ?

Jetpac unlimited. Normal speed for the first 3GB every 24 hours, then up to 1 Mbps until the cycle resets (Jetpac Japan page). For maps, chat and photos, many people never reach 3GB. For video calls, stories and a laptop on hotspot, many do.

ESIM KIMONO unlimited. A flat 10 Mbps from the first minute, with no daily data cap. The speed at 9 am is the speed at 9 pm. The whole rule is on one fair use page.

Fixed-data plans. Our fixed plans run at full network speed, then 384 kbps once the data is used, for the rest of the plan. Jetpac's approach is different: on its 3GB and larger packs, Jetpac keeps WhatsApp, Maps and Uber working after the data runs out (Jetpac Japan page). That is a real perk.

Which network does each one use?

Jetpac's Japan product page does not name the network (Jetpac Japan page). ESIM KIMONO runs on KDDI 4G/5G, a licensed Japanese carrier, and the network is printed on every plan before you pay.

Knowing the carrier matters on a trip. It tells you what coverage to expect in the mountains, what APN to use if the phone asks, and what to search for if something looks wrong.

Jetpac and ESIM KIMONO side by side

	Jetpac	ESIM KIMONO
Network named on the product page	Not named	KDDI 4G/5G
Unlimited speed rule	3GB a day at normal speed, then up to 1 Mbps	Flat 10 Mbps, no daily data cap
After fixed data runs out	WhatsApp, Maps and Uber keep working on 3GB+ packs	Slows to 384 kbps for the rest of the plan
Hotspot	See product page	Most plans; rule printed at checkout
Refund once installed	An installed eSIM counts as used (T&Cs.pdf))	Unused plans refunded under package terms; faulty eSIM replaced 1 for 1
Delivery	Ordered online	QR code by email in minutes, no account, no app

Sources: Jetpac Japan page, Jetpac T&Cs.pdf), checked 13 October 2026; our /fup/.

When is Jetpac the right pick?

You use under 3GB a day. Maps, chat and a few photos rarely pass that, and the daily slowdown never touches you.
You like the safety net. Free WhatsApp, Maps and Uber after the data runs out is genuinely useful when you are lost.

If that describes your trip, Jetpac is a sensible choice and you do not need us.

When does ESIM KIMONO fit better?

You hit 3GB by mid-afternoon. Video calls home, stories, a laptop on hotspot. At 1 Mbps those struggle; at 10 Mbps they work.
You want the network named before you pay. Ours is KDDI, printed on the plan.
You want a refund rule you can rely on. Unused plans are refunded under the package terms, and a faulty eSIM is replaced 1 for 1.
You want a person, not a form. Real humans answer on chat and at [email protected].

What happens if the eSIM fails when I land?

The usual horror story is Haneda arrivals, an eSIM that will not activate, and a queue for a physical SIM with your passport in hand.

With ESIM KIMONO, you install on home Wi-Fi before flying, from a QR code that arrives by email in minutes. No account, no app. If the eSIM is faulty, we replace it 1 for 1, and a person on chat walks you through the APN for iPhone or Android if needed.

Who runs ESIM KIMONO?

Fizen LLC. Fizen.io has 500,000+ app users and a strategic investment from Tether. The eSIM uses a GSMA standard profile on KDDI's licensed network, and card payments run on Stripe (PCI DSS Level 1). Plans are data only, with no phone number.

FAQ

Does Jetpac's Japan unlimited slow down?

Yes. Jetpac's page says the first 3GB every 24 hours runs at normal speed, then up to 1 Mbps until the cycle resets.

Which network does Jetpac use in Japan?

Its Japan product page does not name one. ESIM KIMONO runs on KDDI 4G/5G.

How does ESIM KIMONO compare with Jetpac on price?

We don't compete on price. Plans are priced for a carrier-grade network and a human who answers. Today's price is on the button below.

Can I get a refund on Jetpac after installing?

Jetpac's terms say an installed eSIM counts as used. Our unused plans are refunded under the package terms.

Can I keep Jetpac installed and add another eSIM?

Yes. Most phones store several eSIMs. Switch the data line to the one you want and keep roaming on for it.

All Japan plans

Competitor facts on this page were checked on 13 October 2026 on their own pages. The button above shows today's price.