KDDI Starlink Mobile V2 targets calls and faster data by the end of 2027
*Original editorial illustration. It does not show a live connection, exact coverage area or promised device experience.*
KDDI announced on September 15 that it had concluded an agreement with SpaceX for Starlink Mobile V2. The company aims to add high-speed satellite data and native voice calls to au Starlink Direct by the end of 2027.
That is a roadmap, not a launch. Today's au Starlink Direct supports messages and selected compatible apps on eligible lines and phones when the terrestrial au network is unavailable. Native voice calls, unrestricted browsing and the faster V2 link are not available through the current service.
The traveler takeaway: V2 could make an eligible au phone much more useful in a remote Japanese dead zone. It does not give a visitor's travel eSIM satellite access today, and KDDI has not yet published the V2 price, final phone list or detailed launch date.
What KDDI announced
KDDI and SpaceX concluded their agreement on August 10 and announced it on September 15. KDDI says it aims to begin offering the service by the end of 2027.
The more detailed Japanese announcement describes Mobile V2 satellites as having about 20 times the throughput per satellite and about 100 times the data density of the first generation. Those are network-design comparisons supplied by KDDI and SpaceX. They are not measured customer speeds, a minimum speed guarantee or a promise that every handset will perform identically.
The planned service would support web browsing, video streaming and other high-speed applications as well as native VoLTE calls. KDDI has not announced a retail price, exact start day, eligible plan list, supported device list, hotspot policy or service-level guarantee for V2.
SpaceX's Mobile product page describes the broader V2 system as an upgraded direct-to-device platform. KDDI's own notices remain the authority for what au customers in Japan can actually use and when.
Current service and the V2 roadmap are different products
The safest way to read the announcement is to separate live functions from planned ones.
| Traveler question | au Starlink Direct now | KDDI Mobile V2 target |
|---|---|---|
| Status | Live under current au conditions | Aimed for launch by the end of 2027 |
| Messages | Supported on eligible setups | Expected to remain, with final terms unpublished |
| App data | Selected compatible apps | High-speed apps, browsing and streaming planned |
| Native voice calls | Not available over satellite | VoLTE calls planned |
| Eligibility | Current au, UQ mobile, povo and dedicated-plan rules apply | Not announced |
| Compatible phones | Current published device list applies | Final V2 list not announced |
| Price | Current plan and offer rules apply | Not announced |
| Operating environment | Outdoor dead zones with open sky | Final V2 conditions not announced |
The target date is also important. “By the end of 2027” is not the same as a guaranteed nationwide switch-on date. Travelers should wait for a dated commercial launch notice and updated terms before relying on V2 for a trip.
KDDI's project is distinct from Docomo's Starlink Mobile V2 roadmap. Docomo has announced a fiscal-2028 target for its own service. Different operator, account and device rules will apply.
What au Starlink Direct can do today
KDDI launched au Starlink Direct in April 2025 with messaging. It added selected data apps in August 2025. The current service page lists compatible messaging and data functions, but it still says voice calls are unavailable.
Current access is intended for locations in Japan, including published coastal-water coverage, where au 5G and 4G LTE are unavailable. The phone needs an outdoor view of the sky. Buildings, dense trees, steep terrain, weather, movement and network demand can delay or prevent a connection.
Selected app support is not the same as ordinary internet access. App versions and supported functions can change, and a compatible app may have limited features over satellite. Download apps, maps, tickets and software updates before leaving terrestrial coverage.
The current service does not turn every recent phone into a satellite phone. KDDI maintains a supported-device page and distinguishes some au or UQ-sold devices from models bought elsewhere. An unlocked or SIM-free phone may still need to be explicitly tested and listed.
Can visitors use the current satellite service?
Some people without a standard au contract can use the current service, but only through KDDI's published eligibility paths. Its support page says qualifying UQ mobile and povo users can access the service under current rules. Users of other carriers can subscribe to the separate au Starlink Direct dedicated plan+ if their phone and setup qualify.
The dedicated plan+ page currently shows selected UQ plans at no monthly charge, other UQ plans at ¥550 per month after an introductory period and other carriers, including povo, at ¥1,650 per month after the first three months at no charge. It also lists 1 GB of terrestrial data. Satellite use is temporarily not counted against that allowance. These are present-day terms, not V2 pricing, and KDDI can change them.
A foreign visitor should not assume that a passport, an unlocked phone or an eSIM-capable device is enough. Account registration, billing, Japanese service eligibility, the exact handset, software and current offer terms all matter. The pages reviewed for this article do not announce a simple V2 visitor pass.
KDDI has also launched separate international au Starlink Direct access in selected countries. That arrangement does not prove that a foreign operator's line works on Japan's domestic service, and it does not make V2 live early.
A Japan travel eSIM does not include this satellite entitlement
A travel eSIM and au Starlink Direct can both involve KDDI's network name without being the same product. A Japan eSIM may use KDDI or au as one terrestrial partner, depending on the package. That does not create an au retail account or add Starlink Direct entitlement to the travel profile.
The distinction is practical:
| Trip need | Better fit |
|---|---|
| Maps, tickets, translation and messages in places with terrestrial coverage | A normal local plan or travel eSIM |
| Current selected satellite functions in an eligible Japanese dead zone | au Starlink Direct on a qualifying line and phone |
| Future broadband or native voice over KDDI satellites | Wait for the commercial V2 launch and final terms |
| Safety-critical communication on a remote itinerary | Offline preparation and appropriate dedicated safety equipment |
At 02:43 UTC on September 18, the public Roaming eSIM catalog returned 43 Japan packages, starting at USD0.60. Depending on the selected package, the listed terrestrial partners can include KDDI or au, NTT Docomo, Rakuten Mobile and SoftBank. Prices, networks and inventory can change, so the live package card is authoritative at checkout.
Use the Japan Roaming eSIM page to compare allowances, validity, network labels and top-up eligibility. It is for terrestrial travel data and does not promise Starlink access. For plan selection rather than satellite news, see the Japan eSIM comparison guide.
Where V2 could matter most
Japan has populated cities and rail corridors with strong terrestrial coverage, but it also has mountain roads, remote islands, hiking routes and coastal areas where a phone can lose ground service. A faster direct-to-device layer could make ordinary communication more practical in some of those gaps.
That possibility should not be turned into a coverage promise. KDDI has not published a final V2 map, indoor-performance rule, train-speed limit or guaranteed offshore range. Even the current service needs open sky and can be interrupted. Satellite access also does not extend a rescue service, remove local hazards or replace route planning.
For a 2026 or early-2027 trip, plan around services that are live at the time of travel. Save maps and bookings offline, keep a charged power bank, tell someone your route and check whether the areas you will visit have ordinary mobile coverage. If communication is safety-critical, use equipment and procedures designed for that risk.
Questions travelers are asking about KDDI Starlink Mobile V2
Is KDDI Starlink Mobile V2 available now?
No. KDDI announced the agreement on September 15, 2026 and aims to begin offering V2 by the end of 2027. Today's au Starlink Direct has a narrower set of functions.
Can a visitor use au Starlink Direct without a normal au line?
Possibly, through the current dedicated plan+, but the traveler still needs to satisfy account, billing, phone, software and service conditions. KDDI has not announced a simple visitor product for Mobile V2.
Does a Japan travel eSIM receive satellite access?
No published source says it does. A package may list KDDI or au as a terrestrial network without inheriting au Starlink Direct or future V2 access.
Will today's supported phones automatically work with V2?
That is not confirmed. Current compatibility does not guarantee support for the faster link or native voice. Wait for KDDI's final V2 device list.
Can au Starlink Direct make normal phone calls now?
No. The current service page says voice calls are unavailable over satellite. Native VoLTE calling is part of the V2 plan for the end of 2027.
How fast will KDDI Starlink Mobile V2 be?
KDDI has not published a customer speed guarantee. Its 20-times throughput and 100-times data-density figures compare satellite generations and should not be read as a promised phone speed.
Will V2 work indoors or on a moving train?
KDDI has not announced final V2 operating rules. The current service requires an outdoor view of the sky, so travelers should not assume reliable indoor or high-speed-train use.
Will satellite use drain the phone battery faster?
KDDI has not published a V2 battery figure. Searching for and maintaining a weak connection can use more power, so carrying a charged power bank remains sensible for remote travel.
Does au Starlink Direct work at sea or on remote islands?
The current page includes Japan and published territorial or coastal waters, subject to signal and service conditions. It is not an open-ocean, cruise-wide or every-island guarantee.
Can V2 replace offline maps or an emergency communicator?
No. A connection can fail because of eligibility, device, terrain, sky view, congestion or power. Save essential information offline and use a dedicated safety device when the route warrants one.
What to check before a future trip
When KDDI announces commercial V2 terms, check six details rather than relying on the headline:
- The exact launch date for the dates and areas of your trip.
- Eligible au, UQ mobile, povo or dedicated-plan accounts.
- The precise phone model, purchase region and software version.
- Retail price, allowance, throttling and renewal rules.
- Native call, emergency call, app, browsing and hotspot support.
- Outdoor, movement, coastal-water and congestion limits.
Until those fields are published, the September announcement is valuable as a direction of travel, not a product travelers can book. Current au customers should use KDDI's live service and device pages. Visitors should choose terrestrial data for the ordinary trip and treat any compatible satellite layer as a separate backup.
Sources and service limits
We reviewed KDDI's Japanese and English Mobile V2 announcements, the current au Starlink Direct service, device, eligibility and dedicated-plan pages, SpaceX's Mobile overview, KDDI's original launch and app-data notices, the separate international-roaming announcement and Docomo's V2 release. Keitai Watch was used as an independent check on the announcement.
We did not infer a V2 price, exact launch day, final handset list, visitor offer, guaranteed speed, hotspot policy or indoor coverage. The public Roaming eSIM Japan catalog was checked on September 18, 2026. Inventory and retail terms can change, and the live product page controls at checkout. We will update this guide when KDDI publishes material commercial terms.
