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 the second largest group.
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 accounted for 34%.
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Author's summary: T-Mobile US and AT&T customers use Starlink D2D service.