Updated October 13, 2026 · NomadCue Editorial Team
KDDI au vs T-Mobile US
KDDI au
Higher score in this comparison
T-Mobile US
KDDI au vs T-Mobile US: the differences
| Compare | KDDI auReviewSee alternativesSee alternatives | T-Mobile USReviewSee alternativesSee alternatives |
|---|---|---|
| Price from | ¥800 | Not confirmed |
| Countries covered | 17 | Not confirmed |
| Unlimited data | Yes | Not confirmed |
| Hotspot sharing | Yes | Not confirmed |
| 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 | Not confirmed |
| Fair use policy | Speed may be throttled if heavy data use occurs within a 24-hour period | Not confirmed |
Same on both: Seller type (Carrier).
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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.
T-Mobile US
T-Mobile US focuses on phone service with 5G plans, phones and home internet for use in America. T-Mobile US suits people arranging ongoing domestic longer stays who want satellite coverage and app based joining from one carrier for everyday mobile service.
Score breakdown
| Area | KDDI au | T-Mobile US |
|---|---|---|
| Cost | 9.2 | Not confirmed |
| Offer | 8.8Carrier plan from KDDI Corporation with unlimited data, hotspot sharing and prices from ¥800, though coverage is 17 countries. | 9.7Higher |
| Trust | Not confirmed | 9.6 |
How they place
| Ranking | KDDI au | T-Mobile US |
|---|---|---|
| Travel SIMs and eSIMs | 263 of 926 | 783 of 926 |
| Travel eSIMs | 270 of 918 | 783 of 918 |
| Pocket WiFi rental | 53 of 193 | 155 of 193 |
Every fact side by side
| Fact | KDDI au | T-Mobile US |
|---|---|---|
| Region | Not confirmed | Local |
| Features | Unlimited data, Hotspot, Carrier plan | Not confirmed |
| Audience | Short trip, Long trip | Not confirmed |
| Legal entity | KDDI Corporation | T-Mobile US, Inc. |
| Headquarters | Not confirmed | United States |
| Founded | Not confirmed | 1994 |
| Support channels | Phone, Help centre | Chat, Phone, Help centre, CommunityCovers more |
Pocket Wi-Fi
| Fact | KDDI au | T-Mobile US |
|---|---|---|
| Daily price | Not confirmed | $10 |
| Data allowance | Not confirmed | 2GB |
| Pickup and delivery | Not confirmed | Free same-day delivery when ordering in the T-Life app or online |
Where each stands against the rest
| Fact | KDDI au | T-Mobile US | Median |
|---|---|---|---|
| Price from | ¥800below the median | Not confirmed | ¥840 |
| Countries covered | 17lowest quarter | Not confirmed | 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.
T-Mobile US
Pros
- Operates its own 5G mobile network across America
- Offers 5G plans alongside phones and home internet service
- Provides satellite coverage to stay connected beyond regular signal
Cons
- Serves one domestic market instead of multiple travel destinations
- Catalog centers on full phone plans rather than short visitor options
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.
T-Mobile US
Who it suits
- People arranging longer stays around America
- Shoppers wanting phone, plan and home internet together
Who should look elsewhere
- Visitors seeking short multi country trips
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
Country by country
| Country | KDDI au | T-Mobile US |
|---|---|---|
| Japan | Yes | No |
| United States | No | Yes |
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.
T-Mobile US
What does T-Mobile US sell?+
T-Mobile US sells phone service with 5G plans, phones, and home internet service. It also offers satellite coverage for staying connected outside regular signal areas. The range centers on ongoing service with options to bring an existing number or add a line.
Where does T-Mobile US work?+
The service works across America on the carrier 5G network with added satellite coverage. Home internet service reaches domestic addresses with door delivery in covered areas. The focus remains on one home market rather than multi country travel use.
Other options to compare
Related by the facts
KDDI au
T-Mobile US