Updated September 28, 2026 · NomadCue Editorial Team
KDDI au vs Smart Axiata
KDDI au
Smart Axiata
Higher score in this comparison
KDDI au vs Smart Axiata: the differences
| Compare | KDDI auReviewSee alternativesSee alternatives | Smart AxiataReviewSee alternativesSee alternatives |
|---|---|---|
| Price from | ¥800 | $2 |
| Countries covered | 17 | 143Higher |
| Reference plan prices | US 800 JPY/24h reserved; Europe 1000 JPY/24h reserved (1000 JPY if any 1000-tier country in the itinerary); Thailand 800 JPY/24h; Turkey 800 JPY/24h; Mexico 800 JPY/24h; global 1000 JPY/24h with advance booking or 1200 JPY/24h without; eligible au plan subscribers get up to 15 days free per month, capped at 18000 JPY/month | SmartRoam daily spend caps: US 5 USD, Europe 5 USD, UK 5 USD, Japan 5 USD, Malaysia/Singapore/Vietnam/Indonesia/India/Philippines 2 USD, China/Jordan/Norway 10 USD; roaming in 143 countries. Smart Traveller SIM in Cambodia: 5 USD for 30 GB, 15 days |
| Fair use policy | Speed may be throttled if heavy data use occurs within a 24-hour period | Worry-free data after the daily roaming spend cap is reached: 2 USD/day in most of Asia (Malaysia, Singapore, Vietnam, Indonesia, India, Philippines, Bangladesh, Brunei, Laos, Nepal, Sri Lanka), 5 USD/day in Europe, UK, Japan, South Korea, China Hong Kong/Macao/Taiwan, Australia, New Zealand and the USA, 10 USD/day in China, Jordan and Norway |
| Hotspot sharing | Yes | Not confirmed |
| 5G | Not confirmed | Yes |
| Top-ups | Not confirmed | Yes |
Same on both: Unlimited data (Yes), Seller type (Carrier).
We earn a commission when you sign up through links on this site. Partner status can affect where a brand appears in our rankings. Partners with a live offer in your country come first, then every other brand by score.
Key differences
- Smart Axiata scores higher overall: 9.4 vs 9.0.
- Countries covered is higher at Smart Axiata: 143 vs 17.
- Support channels: only KDDI au offers Help centre.
- Support channels: only Smart Axiata offers Email, Community.
- Features: only KDDI au offers Hotspot.
- Features: only Smart Axiata offers 5G.
- Audience: only KDDI au offers Long trip.
Our verdict on each
KDDI au
KDDI au is a carrier-run daily eSIM from KDDI Corporation that suits au plan subscribers and short trips needing unlimited data and hotspot sharing. Prices start at ¥800 and coverage spans 17 countries, with a fair use policy that can slow speeds after heavy use in a day.
Smart Axiata
Smart Axiata suits short trips that cross Asia and Europe, with roaming across 143 countries and entry prices at $2. It is a carrier based in Cambodia, and unlimited data continues after a daily spend cap, which keeps a heavy data day predictable, though a long stay means paying that cap every day.
Score breakdown
| Area | KDDI au | Smart Axiata |
|---|---|---|
| Cost | 9.2 | 9.7Higher |
| Offer | 8.8Carrier plan from KDDI Corporation with unlimited data, hotspot sharing and prices from ¥800, though coverage is 17 countries. | 9.1Higher |
Where they rank in our lists
| Ranking | KDDI au | Smart Axiata |
|---|---|---|
| Travel SIMs and eSIMs | 263 of 926 | 121 of 926 |
| Travel eSIMs | 270 of 918 | 130 of 918 |
A third option
Roamable has countries covered at 150, against 17 for KDDI au and 143 for Smart Axiata.
Roamable reviewEvery fact side by side
| Fact | KDDI au | Smart Axiata |
|---|---|---|
| Region | Not confirmed | Global |
| Features | Unlimited data, Hotspot, Carrier plan | Unlimited data, 5G, Carrier plan |
| Audience | Short trip, Long tripCovers more | Short trip |
| Legal entity | KDDI Corporation | Smart Axiata Co., Ltd. |
| Headquarters | Not confirmed | Cambodia |
| Support channels | Phone, Help centre | Email, Phone, Community |
Where each stands against the rest
| Fact | KDDI au | Smart Axiata | Median |
|---|---|---|---|
| Countries covered | 17lowest quarter | 143above the median | 120 |
Median across 492 listed travel providers.
Pros and cons
KDDI au
Pros
- Unlimited data and hotspot sharing both appear in unlimited data, hotspot and carrier plan, so one phone can carry a laptop for a day of work.
- Prices start at ¥800, with reference rates for the United States, Thailand, Turkey and Mexico at that level.
- It is sold as a carrier plan from KDDI Corporation, and eligible au plan subscribers can pick up a capped free monthly allowance.
Cons
- Coverage of 17 countries is narrow beside Zwitchy at 200.
- Support runs on phone and help centre only, with no live chat or email listed.
- Unlimited data comes with a fair use policy, and speed can be throttled after heavy use within a day.
Smart Axiata
Pros
- Roaming reaches 143 countries, above the site median of 74 for travel plans.
- Entry prices at $2 sit under the site median of €5.
- Unlimited data keeps working once the fair use policy's daily cap is reached, so a trip never cuts out mid stream.
Cons
- The fair use policy caps daily roaming spend by region, so a heavy data day can cost the cap again the next day.
- Aimed at short trip travel, so a long multi-month stay is not the shape it is built around.
- Support runs on email, phone and community only, with no live chat or help centre in the list.
Who each suits
KDDI au
Who it suits
- Travellers who already subscribe to au at home and want a carrier daily eSIM rather than a marketplace purchase.
- People needing hotspot sharing alongside unlimited data while working from a laptop, where unlimited data, hotspot and carrier plan carries both.
- Travellers whose trip sits in one of the 17 covered countries and who want the ¥800 entry rate.
Who should look elsewhere
- Anyone needing far wider reach, since Zwitchy covers 200 countries against 17 here.
- Price-first buyers who want a lower starting outlay, since eSIMGo.is lists a from price of $0.99.
- Travellers after a simple single-market eSIM, where SimToIsrael lists a from price of $25.
Smart Axiata
Who it suits
- Travellers on a short holiday or business run who want one roaming plan across Asia and Europe rather than a purchase per country.
- Anyone heading out of Cambodia, since Smart Axiata is the home carrier and top-ups work on its own network.
- Heavy data users content to hit a daily cap, since data carries on after it without further charge.
Who should look elsewhere
- Travellers who need a wider map: Zwitchy reaches 200 countries.
- Budget-first buyers who only want to test a connection: eSIMGo.is starts at $0.99.
Current offers
KDDI au
Current offer
First period offer
AEON online English conversation, first month half price via au overseas page: 6,980 JPY/month -> 3,490 JPY first month (tax incl.) for the daily plan; 4,880 JPY/month -> 2,440 JPY first month (tax incl.) for the 8-lesson plan
Campaign deadline 9/30 (Wed); native-teacher plans; partner offer shown on the au海外放題 page
Source, checked September 26, 2026
Smart Axiata
Current offer
Discount code
Smart eSIM 50% off special number: 50% off a special number
Every new eSIM purchase
Source, checked September 26, 2026
Bonus
Get 1GB data in SmartNas for FREE every day: 1 GB free data per day
For Smart Laor! plan subscribers who register on the EBC website
Source, checked September 26, 2026
Bonus
Subscribe, Save, and Win: S-Coins to unlock vaults and win prizes
Earn S-Coins with plan subscriptions
Source, checked September 26, 2026
Country by country
| Country | KDDI au | Smart Axiata |
|---|---|---|
| Cambodia | No | Yes |
| Japan | Yes | No |
Questions about each
KDDI au
How much does a KDDI au eSIM cost?+
Reference prices are set by region, and the entry price is ¥800. The United States, Thailand, Turkey and Mexico sit at that level, Europe is costlier, and global plans are cheaper when booked in advance. Eligible au plan subscribers can also take a capped free monthly allowance.
Is the data allowance really unlimited?+
Unlimited data and hotspot sharing are both part of unlimited data, hotspot and carrier plan. A fair use policy still applies, with speed throttled if heavy data use happens within a day, so the allowance is generous rather than unthrottled for constant streaming.
Smart Axiata
What does Smart Axiata cost for roaming data?+
Entry prices start at $2, and the roaming offer runs on a daily spend cap rather than a data allowance. The fair use policy sets a lower cap for most of Asia and higher caps across Europe, the UK, Japan, South Korea, China, Australia, New Zealand, the USA, Jordan and Norway.
Is the data really unlimited?+
Unlimited data is listed among unlimited data, 5g and carrier plan for the roaming offer. The fair use policy explains the catch: data keeps flowing after the daily roaming spend cap is reached, so a heavy user simply pays the cap again on the next day instead of losing service or being cut off mid trip.
Other options to compare
Related by the facts
KDDI au
Smart Axiata