T-Mobile US customers were the largest users of the operator's direct-to-device (D2D) satellite service with Starlink as of September, but AT&T users were also drawn to the service.
According to research by Ookla, a network performance measurement company, T-Mobile customers accounted for 60.9% of the usage on T-Mobile's T-Satellite service, while AT&T users came in second at 34%.
T-Mobile's satellite service, provisioned by Starlink, launched nationwide in July after six months of beta testing. The service is available for free to subscribers of T-Mobile's Experience Beyond or Go5G Next plans, and for $10 per month for a limited time for others, before increasing to $15 per month.
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Author's summary: T-Mobile US and AT&T customers use D2D satellite service.