KDDI expanded the capabilities of a direct-to-device (D2D) satellite communications service using SpaceX’s Starlink constellation, with an initial portfolio of compatible smartphones spanning devices from Google and Samsung.

The Japanese operator’s au Starlink Direct service adds data connectivity to an existing D2D messaging option and is currently configured for 19 apps on Google’s Pixel 10 series and Samsung’s Galaxy Z Fold 7 and Flip 7 models.

KDDI was frank about the capabilities of the D2D arrangement, noting service availability relies on the sky being visible, potential latency in sending and receiving messages and the “connection may be unstable”.

The operator expects the Starlink set-up to bridge an approximately 40 per cent gap in its geographic coverage.

KDDI emphasised its population coverage stands at 99.9 per cent.

It stated “UQ Mobile, povo and other carrier users” will be able to sign up to au Starlink Direct from 1 September, with a special tariff of JPY1,650 ($11.21) per month commencing after a promotional free period spanning three months.

Google Maps, X, and various weather and environmental information apps are among the first 19 accessible over the D2D connection, and KDDI plans to provide developer support to boost the number of compatible services.

KDDI originally connected with SpaceX in 2022 and has since employed Starlink connectivity in building projects and maritime services.